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Finding the Fourth Proportional to 731.38, 1,008.90 and 482.60

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Solution

The fourth proportional to 731.38, 1,008.90 and 482.60 is: 665.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.38 : 1,008.90 = 482.60 : x
  2. Step 2: Convert to fraction form
    731.38/1,008.90 = 482.60/x
  3. Step 3: Cross multiply
    731.38x = 1,008.90 × 482.60
  4. Step 4: Simplify right side
    731.38x = 486,895.14
  5. Step 5: Solve for x
    x = 486,895.14/731.38
  6. Step 6: Final answer
    x = 665.72

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Find fourth proportional to 365.69, 504.45 and 241.30
Half scale
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Double scale
Find fourth proportional to 732.38, 1,010.28 and 483.60
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.