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Finding the Fourth Proportional to 81,639.60, 122,459.40 and 81,121.20

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Solution

The fourth proportional to 81,639.60, 122,459.40 and 81,121.20 is: 121,681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,639.60 : 122,459.40 = 81,121.20 : x
  2. Step 2: Convert to fraction form
    81,639.60/122,459.40 = 81,121.20/x
  3. Step 3: Cross multiply
    81,639.60x = 122,459.40 × 81,121.20
  4. Step 4: Simplify right side
    81,639.60x = 9,934,053,479.28
  5. Step 5: Solve for x
    x = 9,934,053,479.28/81,639.60
  6. Step 6: Final answer
    x = 121,681.80

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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.