Home / 86,721.10-130,081.65-81,472.30

Finding the Fourth Proportional to 86,721.10, 130,081.65 and 81,472.30

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Solution

The fourth proportional to 86,721.10, 130,081.65 and 81,472.30 is: 122,208.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,721.10 : 130,081.65 = 81,472.30 : x
  2. Step 2: Convert to fraction form
    86,721.10/130,081.65 = 81,472.30/x
  3. Step 3: Cross multiply
    86,721.10x = 130,081.65 × 81,472.30
  4. Step 4: Simplify right side
    86,721.10x = 10,598,051,213.30
  5. Step 5: Solve for x
    x = 10,598,051,213.30/86,721.10
  6. Step 6: Final answer
    x = 122,208.45

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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.