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Finding the Fourth Proportional to 124,865.80, 186,909.90 and 72,118.60

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Solution

The fourth proportional to 124,865.80, 186,909.90 and 72,118.60 is: 107,953.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,865.80 : 186,909.90 = 72,118.60 : x
  2. Step 2: Convert to fraction form
    124,865.80/186,909.90 = 72,118.60/x
  3. Step 3: Cross multiply
    124,865.80x = 186,909.90 × 72,118.60
  4. Step 4: Simplify right side
    124,865.80x = 13,479,680,314.14
  5. Step 5: Solve for x
    x = 13,479,680,314.14/124,865.80
  6. Step 6: Final answer
    x = 107,953.34

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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.