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Finding the Fourth Proportional to 125,830.40, 188,832.96 and 81,346.80

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Solution

The fourth proportional to 125,830.40, 188,832.96 and 81,346.80 is: 122,076.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,830.40 : 188,832.96 = 81,346.80 : x
  2. Step 2: Convert to fraction form
    125,830.40/188,832.96 = 81,346.80/x
  3. Step 3: Cross multiply
    125,830.40x = 188,832.96 × 81,346.80
  4. Step 4: Simplify right side
    125,830.40x = 15,360,957,030.53
  5. Step 5: Solve for x
    x = 15,360,957,030.53/125,830.40
  6. Step 6: Final answer
    x = 122,076.68

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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.