Home / 77,068.78-115,610.86-20,909.80

Finding the Fourth Proportional to 77,068.78, 115,610.86 and 20,909.80

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Solution

The fourth proportional to 77,068.78, 115,610.86 and 20,909.80 is: 31,366.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,068.78 : 115,610.86 = 20,909.80 : x
  2. Step 2: Convert to fraction form
    77,068.78/115,610.86 = 20,909.80/x
  3. Step 3: Cross multiply
    77,068.78x = 115,610.86 × 20,909.80
  4. Step 4: Simplify right side
    77,068.78x = 2,417,399,960.43
  5. Step 5: Solve for x
    x = 2,417,399,960.43/77,068.78
  6. Step 6: Final answer
    x = 31,366.79

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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.