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Finding the Fourth Proportional to 21,193.60, 29,251.20 and 14,915.20

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Solution

The fourth proportional to 21,193.60, 29,251.20 and 14,915.20 is: 20,585.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,193.60 : 29,251.20 = 14,915.20 : x
  2. Step 2: Convert to fraction form
    21,193.60/29,251.20 = 14,915.20/x
  3. Step 3: Cross multiply
    21,193.60x = 29,251.20 × 14,915.20
  4. Step 4: Simplify right side
    21,193.60x = 436,287,498.24
  5. Step 5: Solve for x
    x = 436,287,498.24/21,193.60
  6. Step 6: Final answer
    x = 20,585.81

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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.