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Finding the Fourth Proportional to 80,716.80, 121,017.60 and 36,307.20

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Solution

The fourth proportional to 80,716.80, 121,017.60 and 36,307.20 is: 54,434.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,716.80 : 121,017.60 = 36,307.20 : x
  2. Step 2: Convert to fraction form
    80,716.80/121,017.60 = 36,307.20/x
  3. Step 3: Cross multiply
    80,716.80x = 121,017.60 × 36,307.20
  4. Step 4: Simplify right side
    80,716.80x = 4,393,810,206.72
  5. Step 5: Solve for x
    x = 4,393,810,206.72/80,716.80
  6. Step 6: Final answer
    x = 54,434.89

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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.