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Finding the Fourth Proportional to 1,015.54, 1,520.88 and 724.30

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Solution

The fourth proportional to 1,015.54, 1,520.88 and 724.30 is: 1,084.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.54 : 1,520.88 = 724.30 : x
  2. Step 2: Convert to fraction form
    1,015.54/1,520.88 = 724.30/x
  3. Step 3: Cross multiply
    1,015.54x = 1,520.88 × 724.30
  4. Step 4: Simplify right side
    1,015.54x = 1,101,573.38
  5. Step 5: Solve for x
    x = 1,101,573.38/1,015.54
  6. Step 6: Final answer
    x = 1,084.72

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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.