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Finding the Fourth Proportional to 125,920.40, 188,443.20 and 115,422.80

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Solution

The fourth proportional to 125,920.40, 188,443.20 and 115,422.80 is: 172,733.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,920.40 : 188,443.20 = 115,422.80 : x
  2. Step 2: Convert to fraction form
    125,920.40/188,443.20 = 115,422.80/x
  3. Step 3: Cross multiply
    125,920.40x = 188,443.20 × 115,422.80
  4. Step 4: Simplify right side
    125,920.40x = 21,750,641,784.96
  5. Step 5: Solve for x
    x = 21,750,641,784.96/125,920.40
  6. Step 6: Final answer
    x = 172,733.26

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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.