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Finding the Fourth Proportional to 107,612.20, 161,418.30 and 65,621.80

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Solution

The fourth proportional to 107,612.20, 161,418.30 and 65,621.80 is: 98,432.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,612.20 : 161,418.30 = 65,621.80 : x
  2. Step 2: Convert to fraction form
    107,612.20/161,418.30 = 65,621.80/x
  3. Step 3: Cross multiply
    107,612.20x = 161,418.30 × 65,621.80
  4. Step 4: Simplify right side
    107,612.20x = 10,592,559,398.94
  5. Step 5: Solve for x
    x = 10,592,559,398.94/107,612.20
  6. Step 6: Final answer
    x = 98,432.70

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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.