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Finding the Fourth Proportional to 927.92, 1,280.45 and 555

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Solution

The fourth proportional to 927.92, 1,280.45 and 555 is: 765.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.92 : 1,280.45 = 555 : x
  2. Step 2: Convert to fraction form
    927.92/1,280.45 = 555/x
  3. Step 3: Cross multiply
    927.92x = 1,280.45 × 555
  4. Step 4: Simplify right side
    927.92x = 710,646.98
  5. Step 5: Solve for x
    x = 710,646.98/927.92
  6. Step 6: Final answer
    x = 765.85

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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.