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Finding the Fourth Proportional to 928.67, 1,281.21 and 535.55

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Solution

The fourth proportional to 928.67, 1,281.21 and 535.55 is: 738.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.67 : 1,281.21 = 535.55 : x
  2. Step 2: Convert to fraction form
    928.67/1,281.21 = 535.55/x
  3. Step 3: Cross multiply
    928.67x = 1,281.21 × 535.55
  4. Step 4: Simplify right side
    928.67x = 686,150.15
  5. Step 5: Solve for x
    x = 686,150.15/928.67
  6. Step 6: Final answer
    x = 738.85

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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.