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Finding the Fourth Proportional to 80,369.78, 120,538.20 and 30,432.65

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Solution

The fourth proportional to 80,369.78, 120,538.20 and 30,432.65 is: 45,642.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,369.78 : 120,538.20 = 30,432.65 : x
  2. Step 2: Convert to fraction form
    80,369.78/120,538.20 = 30,432.65/x
  3. Step 3: Cross multiply
    80,369.78x = 120,538.20 × 30,432.65
  4. Step 4: Simplify right side
    80,369.78x = 3,668,296,852.23
  5. Step 5: Solve for x
    x = 3,668,296,852.23/80,369.78
  6. Step 6: Final answer
    x = 45,642.74

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1.5x scale

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.