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Finding the Fourth Proportional to 207,493.40, 311,531.70 and 128,761.40

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Solution

The fourth proportional to 207,493.40, 311,531.70 and 128,761.40 is: 193,323.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,493.40 : 311,531.70 = 128,761.40 : x
  2. Step 2: Convert to fraction form
    207,493.40/311,531.70 = 128,761.40/x
  3. Step 3: Cross multiply
    207,493.40x = 311,531.70 × 128,761.40
  4. Step 4: Simplify right side
    207,493.40x = 40,113,257,836.38
  5. Step 5: Solve for x
    x = 40,113,257,836.38/207,493.40
  6. Step 6: Final answer
    x = 193,323.05

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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.