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Finding the Fourth Proportional to 15,659.20, 21,609.12 and 9,371.20

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Solution

The fourth proportional to 15,659.20, 21,609.12 and 9,371.20 is: 12,931.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,659.20 : 21,609.12 = 9,371.20 : x
  2. Step 2: Convert to fraction form
    15,659.20/21,609.12 = 9,371.20/x
  3. Step 3: Cross multiply
    15,659.20x = 21,609.12 × 9,371.20
  4. Step 4: Simplify right side
    15,659.20x = 202,503,385.34
  5. Step 5: Solve for x
    x = 202,503,385.34/15,659.20
  6. Step 6: Final answer
    x = 12,931.91

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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.