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Finding the Fourth Proportional to 99,989.80, 137,988.53 and 54,669.69

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Solution

The fourth proportional to 99,989.80, 137,988.53 and 54,669.69 is: 75,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,989.80 : 137,988.53 = 54,669.69 : x
  2. Step 2: Convert to fraction form
    99,989.80/137,988.53 = 54,669.69/x
  3. Step 3: Cross multiply
    99,989.80x = 137,988.53 × 54,669.69
  4. Step 4: Simplify right side
    99,989.80x = 7,543,790,158.66
  5. Step 5: Solve for x
    x = 7,543,790,158.66/99,989.80
  6. Step 6: Final answer
    x = 75,445.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.