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Finding the Fourth Proportional to 60,620.80, 90,909.60 and 21,179.20

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Solution

The fourth proportional to 60,620.80, 90,909.60 and 21,179.20 is: 31,761.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,620.80 : 90,909.60 = 21,179.20 : x
  2. Step 2: Convert to fraction form
    60,620.80/90,909.60 = 21,179.20/x
  3. Step 3: Cross multiply
    60,620.80x = 90,909.60 × 21,179.20
  4. Step 4: Simplify right side
    60,620.80x = 1,925,392,600.32
  5. Step 5: Solve for x
    x = 1,925,392,600.32/60,620.80
  6. Step 6: Final answer
    x = 31,761.25

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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.