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Finding the Fourth Proportional to 131,439.80, 197,159.70 and 78,822.20

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Solution

The fourth proportional to 131,439.80, 197,159.70 and 78,822.20 is: 118,233.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,439.80 : 197,159.70 = 78,822.20 : x
  2. Step 2: Convert to fraction form
    131,439.80/197,159.70 = 78,822.20/x
  3. Step 3: Cross multiply
    131,439.80x = 197,159.70 × 78,822.20
  4. Step 4: Simplify right side
    131,439.80x = 15,540,561,305.34
  5. Step 5: Solve for x
    x = 15,540,561,305.34/131,439.80
  6. Step 6: Final answer
    x = 118,233.30

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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.