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Finding the Fourth Proportional to 81,700.20, 122,579.10 and 78,820.20

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Solution

The fourth proportional to 81,700.20, 122,579.10 and 78,820.20 is: 118,258.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,700.20 : 122,579.10 = 78,820.20 : x
  2. Step 2: Convert to fraction form
    81,700.20/122,579.10 = 78,820.20/x
  3. Step 3: Cross multiply
    81,700.20x = 122,579.10 × 78,820.20
  4. Step 4: Simplify right side
    81,700.20x = 9,661,709,177.82
  5. Step 5: Solve for x
    x = 9,661,709,177.82/81,700.20
  6. Step 6: Final answer
    x = 118,258.08

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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.