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Finding the Fourth Proportional to 124,902.80, 186,965.40 and 72,155.60

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Solution

The fourth proportional to 124,902.80, 186,965.40 and 72,155.60 is: 108,008.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,902.80 : 186,965.40 = 72,155.60 : x
  2. Step 2: Convert to fraction form
    124,902.80/186,965.40 = 72,155.60/x
  3. Step 3: Cross multiply
    124,902.80x = 186,965.40 × 72,155.60
  4. Step 4: Simplify right side
    124,902.80x = 13,490,600,616.24
  5. Step 5: Solve for x
    x = 13,490,600,616.24/124,902.80
  6. Step 6: Final answer
    x = 108,008.79

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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.