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Finding the Fourth Proportional to 207,915.20, 311,872.80 and 113,436.80

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Solution

The fourth proportional to 207,915.20, 311,872.80 and 113,436.80 is: 170,155.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,915.20 : 311,872.80 = 113,436.80 : x
  2. Step 2: Convert to fraction form
    207,915.20/311,872.80 = 113,436.80/x
  3. Step 3: Cross multiply
    207,915.20x = 311,872.80 × 113,436.80
  4. Step 4: Simplify right side
    207,915.20x = 35,377,852,439.04
  5. Step 5: Solve for x
    x = 35,377,852,439.04/207,915.20
  6. Step 6: Final answer
    x = 170,155.20

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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.