Home / 81,976.10-122,964.15-78,520.10

Finding the Fourth Proportional to 81,976.10, 122,964.15 and 78,520.10

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Solution

The fourth proportional to 81,976.10, 122,964.15 and 78,520.10 is: 117,780.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,976.10 : 122,964.15 = 78,520.10 : x
  2. Step 2: Convert to fraction form
    81,976.10/122,964.15 = 78,520.10/x
  3. Step 3: Cross multiply
    81,976.10x = 122,964.15 × 78,520.10
  4. Step 4: Simplify right side
    81,976.10x = 9,655,157,354.42
  5. Step 5: Solve for x
    x = 9,655,157,354.42/81,976.10
  6. Step 6: Final answer
    x = 117,780.15

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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.