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Finding the Fourth Proportional to 15,609.60, 21,540.15 and 8,535.87

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Solution

The fourth proportional to 15,609.60, 21,540.15 and 8,535.87 is: 11,778.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,609.60 : 21,540.15 = 8,535.87 : x
  2. Step 2: Convert to fraction form
    15,609.60/21,540.15 = 8,535.87/x
  3. Step 3: Cross multiply
    15,609.60x = 21,540.15 × 8,535.87
  4. Step 4: Simplify right side
    15,609.60x = 183,863,920.18
  5. Step 5: Solve for x
    x = 183,863,920.18/15,609.60
  6. Step 6: Final answer
    x = 11,778.90

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1.5x scale

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.