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Finding the Fourth Proportional to 131,422.60, 197,133.90 and 78,891.40

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Solution

The fourth proportional to 131,422.60, 197,133.90 and 78,891.40 is: 118,337.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,422.60 : 197,133.90 = 78,891.40 : x
  2. Step 2: Convert to fraction form
    131,422.60/197,133.90 = 78,891.40/x
  3. Step 3: Cross multiply
    131,422.60x = 197,133.90 × 78,891.40
  4. Step 4: Simplify right side
    131,422.60x = 15,552,169,358.46
  5. Step 5: Solve for x
    x = 15,552,169,358.46/131,422.60
  6. Step 6: Final answer
    x = 118,337.10

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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.