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Finding the Fourth Proportional to 85,414.60, 128,121.90 and 85,414.60

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Solution

The fourth proportional to 85,414.60, 128,121.90 and 85,414.60 is: 128,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,414.60 : 128,121.90 = 85,414.60 : x
  2. Step 2: Convert to fraction form
    85,414.60/128,121.90 = 85,414.60/x
  3. Step 3: Cross multiply
    85,414.60x = 128,121.90 × 85,414.60
  4. Step 4: Simplify right side
    85,414.60x = 10,943,480,839.74
  5. Step 5: Solve for x
    x = 10,943,480,839.74/85,414.60
  6. Step 6: Final answer
    x = 128,121.90

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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.