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Finding the Fourth Proportional to 79,685.20, 119,527.88 and 20,521

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Solution

The fourth proportional to 79,685.20, 119,527.88 and 20,521 is: 30,781.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,685.20 : 119,527.88 = 20,521 : x
  2. Step 2: Convert to fraction form
    79,685.20/119,527.88 = 20,521/x
  3. Step 3: Cross multiply
    79,685.20x = 119,527.88 × 20,521
  4. Step 4: Simplify right side
    79,685.20x = 2,452,831,625.48
  5. Step 5: Solve for x
    x = 2,452,831,625.48/79,685.20
  6. Step 6: Final answer
    x = 30,781.52

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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.