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Finding the Fourth Proportional to 129,216.80, 193,387.80 and 113,470.40

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Solution

The fourth proportional to 129,216.80, 193,387.80 and 113,470.40 is: 169,821.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,216.80 : 193,387.80 = 113,470.40 : x
  2. Step 2: Convert to fraction form
    129,216.80/193,387.80 = 113,470.40/x
  3. Step 3: Cross multiply
    129,216.80x = 193,387.80 × 113,470.40
  4. Step 4: Simplify right side
    129,216.80x = 21,943,791,021.12
  5. Step 5: Solve for x
    x = 21,943,791,021.12/129,216.80
  6. Step 6: Final answer
    x = 169,821.50

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1.5x scale

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.