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Finding the Fourth Proportional to 80,950.40, 121,425.60 and 72,421.10

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Solution

The fourth proportional to 80,950.40, 121,425.60 and 72,421.10 is: 108,631.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,950.40 : 121,425.60 = 72,421.10 : x
  2. Step 2: Convert to fraction form
    80,950.40/121,425.60 = 72,421.10/x
  3. Step 3: Cross multiply
    80,950.40x = 121,425.60 × 72,421.10
  4. Step 4: Simplify right side
    80,950.40x = 8,793,775,520.16
  5. Step 5: Solve for x
    x = 8,793,775,520.16/80,950.40
  6. Step 6: Final answer
    x = 108,631.65

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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.