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Finding the Fourth Proportional to 927.83, 1,280.21 and 554.55

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Solution

The fourth proportional to 927.83, 1,280.21 and 554.55 is: 765.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.83 : 1,280.21 = 554.55 : x
  2. Step 2: Convert to fraction form
    927.83/1,280.21 = 554.55/x
  3. Step 3: Cross multiply
    927.83x = 1,280.21 × 554.55
  4. Step 4: Simplify right side
    927.83x = 709,937.68
  5. Step 5: Solve for x
    x = 709,937.68/927.83
  6. Step 6: Final answer
    x = 765.16

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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.