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Finding the Fourth Proportional to 80,686.80, 121,145.40 and 45,694.80

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Solution

The fourth proportional to 80,686.80, 121,145.40 and 45,694.80 is: 68,607.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,686.80 : 121,145.40 = 45,694.80 : x
  2. Step 2: Convert to fraction form
    80,686.80/121,145.40 = 45,694.80/x
  3. Step 3: Cross multiply
    80,686.80x = 121,145.40 × 45,694.80
  4. Step 4: Simplify right side
    80,686.80x = 5,535,714,823.92
  5. Step 5: Solve for x
    x = 5,535,714,823.92/80,686.80
  6. Step 6: Final answer
    x = 68,607.44

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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.