Home / 86,427.10-129,640.65-81,178.30

Finding the Fourth Proportional to 86,427.10, 129,640.65 and 81,178.30

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Solution

The fourth proportional to 86,427.10, 129,640.65 and 81,178.30 is: 121,767.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,427.10 : 129,640.65 = 81,178.30 : x
  2. Step 2: Convert to fraction form
    86,427.10/129,640.65 = 81,178.30/x
  3. Step 3: Cross multiply
    86,427.10x = 129,640.65 × 81,178.30
  4. Step 4: Simplify right side
    86,427.10x = 10,524,007,577.90
  5. Step 5: Solve for x
    x = 10,524,007,577.90/86,427.10
  6. Step 6: Final answer
    x = 121,767.45

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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.