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Finding the Fourth Proportional to 928.52, 1,280.58 and 721.16

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Solution

The fourth proportional to 928.52, 1,280.58 and 721.16 is: 994.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.52 : 1,280.58 = 721.16 : x
  2. Step 2: Convert to fraction form
    928.52/1,280.58 = 721.16/x
  3. Step 3: Cross multiply
    928.52x = 1,280.58 × 721.16
  4. Step 4: Simplify right side
    928.52x = 923,503.07
  5. Step 5: Solve for x
    x = 923,503.07/928.52
  6. Step 6: Final answer
    x = 994.60

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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.