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Finding the Fourth Proportional to 938.92, 1,407.70 and 452.36

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Solution

The fourth proportional to 938.92, 1,407.70 and 452.36 is: 678.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.92 : 1,407.70 = 452.36 : x
  2. Step 2: Convert to fraction form
    938.92/1,407.70 = 452.36/x
  3. Step 3: Cross multiply
    938.92x = 1,407.70 × 452.36
  4. Step 4: Simplify right side
    938.92x = 636,787.17
  5. Step 5: Solve for x
    x = 636,787.17/938.92
  6. Step 6: Final answer
    x = 678.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.