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Finding the Fourth Proportional to 500.46, 690.48 and 279.38

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Solution

The fourth proportional to 500.46, 690.48 and 279.38 is: 385.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.46 : 690.48 = 279.38 : x
  2. Step 2: Convert to fraction form
    500.46/690.48 = 279.38/x
  3. Step 3: Cross multiply
    500.46x = 690.48 × 279.38
  4. Step 4: Simplify right side
    500.46x = 192,906.30
  5. Step 5: Solve for x
    x = 192,906.30/500.46
  6. Step 6: Final answer
    x = 385.46

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Double scale
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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.