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Finding the Fourth Proportional to 80,679.84, 121,019.40 and 30,748.56

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Solution

The fourth proportional to 80,679.84, 121,019.40 and 30,748.56 is: 46,122.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,679.84 : 121,019.40 = 30,748.56 : x
  2. Step 2: Convert to fraction form
    80,679.84/121,019.40 = 30,748.56/x
  3. Step 3: Cross multiply
    80,679.84x = 121,019.40 × 30,748.56
  4. Step 4: Simplify right side
    80,679.84x = 3,721,172,282.06
  5. Step 5: Solve for x
    x = 3,721,172,282.06/80,679.84
  6. Step 6: Final answer
    x = 46,122.70

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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.