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Finding the Fourth Proportional to 80,488.89, 120,719.57 and 21,330.54

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Solution

The fourth proportional to 80,488.89, 120,719.57 and 21,330.54 is: 31,992.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,488.89 : 120,719.57 = 21,330.54 : x
  2. Step 2: Convert to fraction form
    80,488.89/120,719.57 = 21,330.54/x
  3. Step 3: Cross multiply
    80,488.89x = 120,719.57 × 21,330.54
  4. Step 4: Simplify right side
    80,488.89x = 2,575,013,510.02
  5. Step 5: Solve for x
    x = 2,575,013,510.02/80,488.89
  6. Step 6: Final answer
    x = 31,992.16

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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.