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Finding the Fourth Proportional to 7,281.28, 10,921.82 and 5,135.30

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Solution

The fourth proportional to 7,281.28, 10,921.82 and 5,135.30 is: 7,702.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,281.28 : 10,921.82 = 5,135.30 : x
  2. Step 2: Convert to fraction form
    7,281.28/10,921.82 = 5,135.30/x
  3. Step 3: Cross multiply
    7,281.28x = 10,921.82 × 5,135.30
  4. Step 4: Simplify right side
    7,281.28x = 56,086,822.25
  5. Step 5: Solve for x
    x = 56,086,822.25/7,281.28
  6. Step 6: Final answer
    x = 7,702.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.