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Finding the Fourth Proportional to 128,041.40, 192,062.10 and 81,500.60

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Solution

The fourth proportional to 128,041.40, 192,062.10 and 81,500.60 is: 122,250.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,041.40 : 192,062.10 = 81,500.60 : x
  2. Step 2: Convert to fraction form
    128,041.40/192,062.10 = 81,500.60/x
  3. Step 3: Cross multiply
    128,041.40x = 192,062.10 × 81,500.60
  4. Step 4: Simplify right side
    128,041.40x = 15,653,176,387.26
  5. Step 5: Solve for x
    x = 15,653,176,387.26/128,041.40
  6. Step 6: Final answer
    x = 122,250.90

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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.