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Finding the Fourth Proportional to 938.39, 1,295.39 and 624.21

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Solution

The fourth proportional to 938.39, 1,295.39 and 624.21 is: 861.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.39 : 1,295.39 = 624.21 : x
  2. Step 2: Convert to fraction form
    938.39/1,295.39 = 624.21/x
  3. Step 3: Cross multiply
    938.39x = 1,295.39 × 624.21
  4. Step 4: Simplify right side
    938.39x = 808,592.09
  5. Step 5: Solve for x
    x = 808,592.09/938.39
  6. Step 6: Final answer
    x = 861.68

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Double scale
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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.