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Finding the Fourth Proportional to 99,438.80, 149,239.80 and 98,661.20

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Solution

The fourth proportional to 99,438.80, 149,239.80 and 98,661.20 is: 148,072.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,438.80 : 149,239.80 = 98,661.20 : x
  2. Step 2: Convert to fraction form
    99,438.80/149,239.80 = 98,661.20/x
  3. Step 3: Cross multiply
    99,438.80x = 149,239.80 × 98,661.20
  4. Step 4: Simplify right side
    99,438.80x = 14,724,177,755.76
  5. Step 5: Solve for x
    x = 14,724,177,755.76/99,438.80
  6. Step 6: Final answer
    x = 148,072.76

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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.