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Finding the Fourth Proportional to 18,490.56, 25,479.84 and 15,691.20

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Solution

The fourth proportional to 18,490.56, 25,479.84 and 15,691.20 is: 21,622.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,490.56 : 25,479.84 = 15,691.20 : x
  2. Step 2: Convert to fraction form
    18,490.56/25,479.84 = 15,691.20/x
  3. Step 3: Cross multiply
    18,490.56x = 25,479.84 × 15,691.20
  4. Step 4: Simplify right side
    18,490.56x = 399,809,265.41
  5. Step 5: Solve for x
    x = 399,809,265.41/18,490.56
  6. Step 6: Final answer
    x = 21,622.34

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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.