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Finding the Fourth Proportional to 99,704.80, 149,557.20 and 81,990.10

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Solution

The fourth proportional to 99,704.80, 149,557.20 and 81,990.10 is: 122,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,704.80 : 149,557.20 = 81,990.10 : x
  2. Step 2: Convert to fraction form
    99,704.80/149,557.20 = 81,990.10/x
  3. Step 3: Cross multiply
    99,704.80x = 149,557.20 × 81,990.10
  4. Step 4: Simplify right side
    99,704.80x = 12,262,209,783.72
  5. Step 5: Solve for x
    x = 12,262,209,783.72/99,704.80
  6. Step 6: Final answer
    x = 122,985.15

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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.