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Finding the Fourth Proportional to 125,630.60, 188,117.85 and 81,015.80

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Solution

The fourth proportional to 125,630.60, 188,117.85 and 81,015.80 is: 121,312.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,630.60 : 188,117.85 = 81,015.80 : x
  2. Step 2: Convert to fraction form
    125,630.60/188,117.85 = 81,015.80/x
  3. Step 3: Cross multiply
    125,630.60x = 188,117.85 × 81,015.80
  4. Step 4: Simplify right side
    125,630.60x = 15,240,518,112.03
  5. Step 5: Solve for x
    x = 15,240,518,112.03/125,630.60
  6. Step 6: Final answer
    x = 121,312.15

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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.