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Finding the Fourth Proportional to 10,658.40, 15,987.60 and 8,815.20

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Solution

The fourth proportional to 10,658.40, 15,987.60 and 8,815.20 is: 13,222.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,658.40 : 15,987.60 = 8,815.20 : x
  2. Step 2: Convert to fraction form
    10,658.40/15,987.60 = 8,815.20/x
  3. Step 3: Cross multiply
    10,658.40x = 15,987.60 × 8,815.20
  4. Step 4: Simplify right side
    10,658.40x = 140,933,891.52
  5. Step 5: Solve for x
    x = 140,933,891.52/10,658.40
  6. Step 6: Final answer
    x = 13,222.80

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Similar ratio
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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.