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Finding the Fourth Proportional to 107,931.20, 161,896.80 and 85,380.80

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Solution

The fourth proportional to 107,931.20, 161,896.80 and 85,380.80 is: 128,071.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,931.20 : 161,896.80 = 85,380.80 : x
  2. Step 2: Convert to fraction form
    107,931.20/161,896.80 = 85,380.80/x
  3. Step 3: Cross multiply
    107,931.20x = 161,896.80 × 85,380.80
  4. Step 4: Simplify right side
    107,931.20x = 13,822,878,301.44
  5. Step 5: Solve for x
    x = 13,822,878,301.44/107,931.20
  6. Step 6: Final answer
    x = 128,071.20

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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.