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Finding the Fourth Proportional to 691.72, 1,038.30 and 473.20

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Solution

The fourth proportional to 691.72, 1,038.30 and 473.20 is: 710.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.72 : 1,038.30 = 473.20 : x
  2. Step 2: Convert to fraction form
    691.72/1,038.30 = 473.20/x
  3. Step 3: Cross multiply
    691.72x = 1,038.30 × 473.20
  4. Step 4: Simplify right side
    691.72x = 491,323.56
  5. Step 5: Solve for x
    x = 491,323.56/691.72
  6. Step 6: Final answer
    x = 710.29

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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.