Home / 207,915.10-311,872.65-128,772.70

Finding the Fourth Proportional to 207,915.10, 311,872.65 and 128,772.70

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Solution

The fourth proportional to 207,915.10, 311,872.65 and 128,772.70 is: 193,159.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,915.10 : 311,872.65 = 128,772.70 : x
  2. Step 2: Convert to fraction form
    207,915.10/311,872.65 = 128,772.70/x
  3. Step 3: Cross multiply
    207,915.10x = 311,872.65 × 128,772.70
  4. Step 4: Simplify right side
    207,915.10x = 40,160,683,196.66
  5. Step 5: Solve for x
    x = 40,160,683,196.66/207,915.10
  6. Step 6: Final answer
    x = 193,159.05

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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.