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Finding the Fourth Proportional to 80,369.80, 120,559.71 and 21,205.53

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Solution

The fourth proportional to 80,369.80, 120,559.71 and 21,205.53 is: 31,809.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,369.80 : 120,559.71 = 21,205.53 : x
  2. Step 2: Convert to fraction form
    80,369.80/120,559.71 = 21,205.53/x
  3. Step 3: Cross multiply
    80,369.80x = 120,559.71 × 21,205.53
  4. Step 4: Simplify right side
    80,369.80x = 2,556,532,547.20
  5. Step 5: Solve for x
    x = 2,556,532,547.20/80,369.80
  6. Step 6: Final answer
    x = 31,809.62

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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.