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Finding the Fourth Proportional to 99,979.80, 149,972.40 and 43,791

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Solution

The fourth proportional to 99,979.80, 149,972.40 and 43,791 is: 65,687.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,979.80 : 149,972.40 = 43,791 : x
  2. Step 2: Convert to fraction form
    99,979.80/149,972.40 = 43,791/x
  3. Step 3: Cross multiply
    99,979.80x = 149,972.40 × 43,791
  4. Step 4: Simplify right side
    99,979.80x = 6,567,441,368.40
  5. Step 5: Solve for x
    x = 6,567,441,368.40/99,979.80
  6. Step 6: Final answer
    x = 65,687.68

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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.