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Finding the Fourth Proportional to 645.47, 890.60 and 365.61

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Solution

The fourth proportional to 645.47, 890.60 and 365.61 is: 504.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.47 : 890.60 = 365.61 : x
  2. Step 2: Convert to fraction form
    645.47/890.60 = 365.61/x
  3. Step 3: Cross multiply
    645.47x = 890.60 × 365.61
  4. Step 4: Simplify right side
    645.47x = 325,613.78
  5. Step 5: Solve for x
    x = 325,613.78/645.47
  6. Step 6: Final answer
    x = 504.46

Related Problems

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Half scale
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Double scale
Find fourth proportional to 646.47, 891.97 and 366.61
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.