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Finding the Fourth Proportional to 81,612.80, 122,419.20 and 56,729.60

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Solution

The fourth proportional to 81,612.80, 122,419.20 and 56,729.60 is: 85,094.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,612.80 : 122,419.20 = 56,729.60 : x
  2. Step 2: Convert to fraction form
    81,612.80/122,419.20 = 56,729.60/x
  3. Step 3: Cross multiply
    81,612.80x = 122,419.20 × 56,729.60
  4. Step 4: Simplify right side
    81,612.80x = 6,944,792,248.32
  5. Step 5: Solve for x
    x = 6,944,792,248.32/81,612.80
  6. Step 6: Final answer
    x = 85,094.40

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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.