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Finding the Fourth Proportional to 99,988.80, 149,985.90 and 43,800

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Solution

The fourth proportional to 99,988.80, 149,985.90 and 43,800 is: 65,701.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,988.80 : 149,985.90 = 43,800 : x
  2. Step 2: Convert to fraction form
    99,988.80/149,985.90 = 43,800/x
  3. Step 3: Cross multiply
    99,988.80x = 149,985.90 × 43,800
  4. Step 4: Simplify right side
    99,988.80x = 6,569,382,420
  5. Step 5: Solve for x
    x = 6,569,382,420/99,988.80
  6. Step 6: Final answer
    x = 65,701.18

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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.