Home / 86,540.10-129,810.15-81,291.30

Finding the Fourth Proportional to 86,540.10, 129,810.15 and 81,291.30

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Solution

The fourth proportional to 86,540.10, 129,810.15 and 81,291.30 is: 121,936.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,540.10 : 129,810.15 = 81,291.30 : x
  2. Step 2: Convert to fraction form
    86,540.10/129,810.15 = 81,291.30/x
  3. Step 3: Cross multiply
    86,540.10x = 129,810.15 × 81,291.30
  4. Step 4: Simplify right side
    86,540.10x = 10,552,435,846.70
  5. Step 5: Solve for x
    x = 10,552,435,846.70/86,540.10
  6. Step 6: Final answer
    x = 121,936.95

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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.