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Finding the Fourth Proportional to 86,820.91, 130,882.10 and 81,034.22

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Solution

The fourth proportional to 86,820.91, 130,882.10 and 81,034.22 is: 122,158.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,820.91 : 130,882.10 = 81,034.22 : x
  2. Step 2: Convert to fraction form
    86,820.91/130,882.10 = 81,034.22/x
  3. Step 3: Cross multiply
    86,820.91x = 130,882.10 × 81,034.22
  4. Step 4: Simplify right side
    86,820.91x = 10,605,929,491.22
  5. Step 5: Solve for x
    x = 10,605,929,491.22/86,820.91
  6. Step 6: Final answer
    x = 122,158.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.