Home / 114,915.20-172,372.80-85,390.70

Finding the Fourth Proportional to 114,915.20, 172,372.80 and 85,390.70

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Solution

The fourth proportional to 114,915.20, 172,372.80 and 85,390.70 is: 128,086.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,915.20 : 172,372.80 = 85,390.70 : x
  2. Step 2: Convert to fraction form
    114,915.20/172,372.80 = 85,390.70/x
  3. Step 3: Cross multiply
    114,915.20x = 172,372.80 × 85,390.70
  4. Step 4: Simplify right side
    114,915.20x = 14,719,034,052.96
  5. Step 5: Solve for x
    x = 14,719,034,052.96/114,915.20
  6. Step 6: Final answer
    x = 128,086.05

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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.