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Finding the Fourth Proportional to 687.80, 1,029.27 and 542

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Solution

The fourth proportional to 687.80, 1,029.27 and 542 is: 811.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.80 : 1,029.27 = 542 : x
  2. Step 2: Convert to fraction form
    687.80/1,029.27 = 542/x
  3. Step 3: Cross multiply
    687.80x = 1,029.27 × 542
  4. Step 4: Simplify right side
    687.80x = 557,864.34
  5. Step 5: Solve for x
    x = 557,864.34/687.80
  6. Step 6: Final answer
    x = 811.09

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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.