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Finding the Fourth Proportional to 81,604.60, 122,406.90 and 56,721.40

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Solution

The fourth proportional to 81,604.60, 122,406.90 and 56,721.40 is: 85,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,604.60 : 122,406.90 = 56,721.40 : x
  2. Step 2: Convert to fraction form
    81,604.60/122,406.90 = 56,721.40/x
  3. Step 3: Cross multiply
    81,604.60x = 122,406.90 × 56,721.40
  4. Step 4: Simplify right side
    81,604.60x = 6,943,090,737.66
  5. Step 5: Solve for x
    x = 6,943,090,737.66/81,604.60
  6. Step 6: Final answer
    x = 85,082.10

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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.