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Finding the Fourth Proportional to 816.72, 1,127.09 and 462.61

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Solution

The fourth proportional to 816.72, 1,127.09 and 462.61 is: 638.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.72 : 1,127.09 = 462.61 : x
  2. Step 2: Convert to fraction form
    816.72/1,127.09 = 462.61/x
  3. Step 3: Cross multiply
    816.72x = 1,127.09 × 462.61
  4. Step 4: Simplify right side
    816.72x = 521,403.10
  5. Step 5: Solve for x
    x = 521,403.10/816.72
  6. Step 6: Final answer
    x = 638.41

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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.