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Finding the Fourth Proportional to 928.24, 1,280.48 and 555.17

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Solution

The fourth proportional to 928.24, 1,280.48 and 555.17 is: 765.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.24 : 1,280.48 = 555.17 : x
  2. Step 2: Convert to fraction form
    928.24/1,280.48 = 555.17/x
  3. Step 3: Cross multiply
    928.24x = 1,280.48 × 555.17
  4. Step 4: Simplify right side
    928.24x = 710,874.90
  5. Step 5: Solve for x
    x = 710,874.90/928.24
  6. Step 6: Final answer
    x = 765.83

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1.5x scale

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.