Home / 86,680.10-130,020.15-81,431.30

Finding the Fourth Proportional to 86,680.10, 130,020.15 and 81,431.30

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Solution

The fourth proportional to 86,680.10, 130,020.15 and 81,431.30 is: 122,146.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,680.10 : 130,020.15 = 81,431.30 : x
  2. Step 2: Convert to fraction form
    86,680.10/130,020.15 = 81,431.30/x
  3. Step 3: Cross multiply
    86,680.10x = 130,020.15 × 81,431.30
  4. Step 4: Simplify right side
    86,680.10x = 10,587,709,840.70
  5. Step 5: Solve for x
    x = 10,587,709,840.70/86,680.10
  6. Step 6: Final answer
    x = 122,146.95

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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.