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Finding the Fourth Proportional to 99,340.80, 149,011.20 and 82,719.60

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Solution

The fourth proportional to 99,340.80, 149,011.20 and 82,719.60 is: 124,079.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,340.80 : 149,011.20 = 82,719.60 : x
  2. Step 2: Convert to fraction form
    99,340.80/149,011.20 = 82,719.60/x
  3. Step 3: Cross multiply
    99,340.80x = 149,011.20 × 82,719.60
  4. Step 4: Simplify right side
    99,340.80x = 12,326,146,859.52
  5. Step 5: Solve for x
    x = 12,326,146,859.52/99,340.80
  6. Step 6: Final answer
    x = 124,079.40

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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.