Home / 131,139.72-196,377.40-81,317.13

Finding the Fourth Proportional to 131,139.72, 196,377.40 and 81,317.13

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Solution

The fourth proportional to 131,139.72, 196,377.40 and 81,317.13 is: 121,769.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,139.72 : 196,377.40 = 81,317.13 : x
  2. Step 2: Convert to fraction form
    131,139.72/196,377.40 = 81,317.13/x
  3. Step 3: Cross multiply
    131,139.72x = 196,377.40 × 81,317.13
  4. Step 4: Simplify right side
    131,139.72x = 15,968,846,564.86
  5. Step 5: Solve for x
    x = 15,968,846,564.86/131,139.72
  6. Step 6: Final answer
    x = 121,769.72

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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.