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Finding the Fourth Proportional to 691.92, 1,038.05 and 281.00

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Solution

The fourth proportional to 691.92, 1,038.05 and 281.00 is: 421.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.92 : 1,038.05 = 281.00 : x
  2. Step 2: Convert to fraction form
    691.92/1,038.05 = 281.00/x
  3. Step 3: Cross multiply
    691.92x = 1,038.05 × 281.00
  4. Step 4: Simplify right side
    691.92x = 291,685.45
  5. Step 5: Solve for x
    x = 291,685.45/691.92
  6. Step 6: Final answer
    x = 421.56

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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.