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Finding the Fourth Proportional to 125,856.40, 188,347.20 and 115,358.80

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Solution

The fourth proportional to 125,856.40, 188,347.20 and 115,358.80 is: 172,637.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,856.40 : 188,347.20 = 115,358.80 : x
  2. Step 2: Convert to fraction form
    125,856.40/188,347.20 = 115,358.80/x
  3. Step 3: Cross multiply
    125,856.40x = 188,347.20 × 115,358.80
  4. Step 4: Simplify right side
    125,856.40x = 21,727,506,975.36
  5. Step 5: Solve for x
    x = 21,727,506,975.36/125,856.40
  6. Step 6: Final answer
    x = 172,637.28

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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.