Home / 77,691.12-107,619.78-76,116.48

Finding the Fourth Proportional to 77,691.12, 107,619.78 and 76,116.48

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Solution

The fourth proportional to 77,691.12, 107,619.78 and 76,116.48 is: 105,438.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,691.12 : 107,619.78 = 76,116.48 : x
  2. Step 2: Convert to fraction form
    77,691.12/107,619.78 = 76,116.48/x
  3. Step 3: Cross multiply
    77,691.12x = 107,619.78 × 76,116.48
  4. Step 4: Simplify right side
    77,691.12x = 8,191,638,831.97
  5. Step 5: Solve for x
    x = 8,191,638,831.97/77,691.12
  6. Step 6: Final answer
    x = 105,438.55

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.