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Finding the Fourth Proportional to 1,038.92, 1,557.15 and 422.31

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Solution

The fourth proportional to 1,038.92, 1,557.15 and 422.31 is: 632.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.92 : 1,557.15 = 422.31 : x
  2. Step 2: Convert to fraction form
    1,038.92/1,557.15 = 422.31/x
  3. Step 3: Cross multiply
    1,038.92x = 1,557.15 × 422.31
  4. Step 4: Simplify right side
    1,038.92x = 657,600.02
  5. Step 5: Solve for x
    x = 657,600.02/1,038.92
  6. Step 6: Final answer
    x = 632.97

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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.