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Finding the Fourth Proportional to 125,519.80, 188,220.30 and 72,945.40

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Solution

The fourth proportional to 125,519.80, 188,220.30 and 72,945.40 is: 109,383.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,519.80 : 188,220.30 = 72,945.40 : x
  2. Step 2: Convert to fraction form
    125,519.80/188,220.30 = 72,945.40/x
  3. Step 3: Cross multiply
    125,519.80x = 188,220.30 × 72,945.40
  4. Step 4: Simplify right side
    125,519.80x = 13,729,805,071.62
  5. Step 5: Solve for x
    x = 13,729,805,071.62/125,519.80
  6. Step 6: Final answer
    x = 109,383.58

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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.