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Finding the Fourth Proportional to 99,346.80, 148,847.40 and 81,721.20

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Solution

The fourth proportional to 99,346.80, 148,847.40 and 81,721.20 is: 122,439.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,346.80 : 148,847.40 = 81,721.20 : x
  2. Step 2: Convert to fraction form
    99,346.80/148,847.40 = 81,721.20/x
  3. Step 3: Cross multiply
    99,346.80x = 148,847.40 × 81,721.20
  4. Step 4: Simplify right side
    99,346.80x = 12,163,988,144.88
  5. Step 5: Solve for x
    x = 12,163,988,144.88/99,346.80
  6. Step 6: Final answer
    x = 122,439.66

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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.