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Finding the Fourth Proportional to 938.76, 1,295.40 and 545.81

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Solution

The fourth proportional to 938.76, 1,295.40 and 545.81 is: 753.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.76 : 1,295.40 = 545.81 : x
  2. Step 2: Convert to fraction form
    938.76/1,295.40 = 545.81/x
  3. Step 3: Cross multiply
    938.76x = 1,295.40 × 545.81
  4. Step 4: Simplify right side
    938.76x = 707,035.80
  5. Step 5: Solve for x
    x = 707,035.80/938.76
  6. Step 6: Final answer
    x = 753.16

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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.