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Finding the Fourth Proportional to 124,623.60, 187,129.80 and 72,135.60

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Solution

The fourth proportional to 124,623.60, 187,129.80 and 72,135.60 is: 108,315.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,623.60 : 187,129.80 = 72,135.60 : x
  2. Step 2: Convert to fraction form
    124,623.60/187,129.80 = 72,135.60/x
  3. Step 3: Cross multiply
    124,623.60x = 187,129.80 × 72,135.60
  4. Step 4: Simplify right side
    124,623.60x = 13,498,720,400.88
  5. Step 5: Solve for x
    x = 13,498,720,400.88/124,623.60
  6. Step 6: Final answer
    x = 108,315.92

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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.