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Finding the Fourth Proportional to 928.72, 1,281.36 and 535.60

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Solution

The fourth proportional to 928.72, 1,281.36 and 535.60 is: 738.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.72 : 1,281.36 = 535.60 : x
  2. Step 2: Convert to fraction form
    928.72/1,281.36 = 535.60/x
  3. Step 3: Cross multiply
    928.72x = 1,281.36 × 535.60
  4. Step 4: Simplify right side
    928.72x = 686,296.42
  5. Step 5: Solve for x
    x = 686,296.42/928.72
  6. Step 6: Final answer
    x = 738.97

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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.