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Finding the Fourth Proportional to 85,891.60, 128,837.40 and 76,706.20

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Solution

The fourth proportional to 85,891.60, 128,837.40 and 76,706.20 is: 115,059.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,891.60 : 128,837.40 = 76,706.20 : x
  2. Step 2: Convert to fraction form
    85,891.60/128,837.40 = 76,706.20/x
  3. Step 3: Cross multiply
    85,891.60x = 128,837.40 × 76,706.20
  4. Step 4: Simplify right side
    85,891.60x = 9,882,627,371.88
  5. Step 5: Solve for x
    x = 9,882,627,371.88/85,891.60
  6. Step 6: Final answer
    x = 115,059.30

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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.