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Finding the Fourth Proportional to 132,459.40, 198,689.10 and 85,220.20

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Solution

The fourth proportional to 132,459.40, 198,689.10 and 85,220.20 is: 127,830.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,459.40 : 198,689.10 = 85,220.20 : x
  2. Step 2: Convert to fraction form
    132,459.40/198,689.10 = 85,220.20/x
  3. Step 3: Cross multiply
    132,459.40x = 198,689.10 × 85,220.20
  4. Step 4: Simplify right side
    132,459.40x = 16,932,324,839.82
  5. Step 5: Solve for x
    x = 16,932,324,839.82/132,459.40
  6. Step 6: Final answer
    x = 127,830.30

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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.