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Finding the Fourth Proportional to 121,419.60, 182,129.40 and 85,990.20

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Solution

The fourth proportional to 121,419.60, 182,129.40 and 85,990.20 is: 128,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,419.60 : 182,129.40 = 85,990.20 : x
  2. Step 2: Convert to fraction form
    121,419.60/182,129.40 = 85,990.20/x
  3. Step 3: Cross multiply
    121,419.60x = 182,129.40 × 85,990.20
  4. Step 4: Simplify right side
    121,419.60x = 15,661,343,531.88
  5. Step 5: Solve for x
    x = 15,661,343,531.88/121,419.60
  6. Step 6: Final answer
    x = 128,985.30

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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.