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Finding the Fourth Proportional to 81,498.60, 122,247.90 and 71,130.60

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Solution

The fourth proportional to 81,498.60, 122,247.90 and 71,130.60 is: 106,695.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,498.60 : 122,247.90 = 71,130.60 : x
  2. Step 2: Convert to fraction form
    81,498.60/122,247.90 = 71,130.60/x
  3. Step 3: Cross multiply
    81,498.60x = 122,247.90 × 71,130.60
  4. Step 4: Simplify right side
    81,498.60x = 8,695,566,475.74
  5. Step 5: Solve for x
    x = 8,695,566,475.74/81,498.60
  6. Step 6: Final answer
    x = 106,695.90

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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.