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Finding the Fourth Proportional to 10,659.30, 15,988.80 and 4,815.90

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Solution

The fourth proportional to 10,659.30, 15,988.80 and 4,815.90 is: 7,223.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,659.30 : 15,988.80 = 4,815.90 : x
  2. Step 2: Convert to fraction form
    10,659.30/15,988.80 = 4,815.90/x
  3. Step 3: Cross multiply
    10,659.30x = 15,988.80 × 4,815.90
  4. Step 4: Simplify right side
    10,659.30x = 77,000,461.92
  5. Step 5: Solve for x
    x = 77,000,461.92/10,659.30
  6. Step 6: Final answer
    x = 7,223.78

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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.