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Finding the Fourth Proportional to 81,080.10, 121,510.80 and 54,350.10

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Solution

The fourth proportional to 81,080.10, 121,510.80 and 54,350.10 is: 81,451.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,080.10 : 121,510.80 = 54,350.10 : x
  2. Step 2: Convert to fraction form
    81,080.10/121,510.80 = 54,350.10/x
  3. Step 3: Cross multiply
    81,080.10x = 121,510.80 × 54,350.10
  4. Step 4: Simplify right side
    81,080.10x = 6,604,124,131.08
  5. Step 5: Solve for x
    x = 6,604,124,131.08/81,080.10
  6. Step 6: Final answer
    x = 81,451.85

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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.