Home / 77,077.40-115,623.79-20,918.41

Finding the Fourth Proportional to 77,077.40, 115,623.79 and 20,918.41

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Solution

The fourth proportional to 77,077.40, 115,623.79 and 20,918.41 is: 31,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,077.40 : 115,623.79 = 20,918.41 : x
  2. Step 2: Convert to fraction form
    77,077.40/115,623.79 = 20,918.41/x
  3. Step 3: Cross multiply
    77,077.40x = 115,623.79 × 20,918.41
  4. Step 4: Simplify right side
    77,077.40x = 2,418,665,503.62
  5. Step 5: Solve for x
    x = 2,418,665,503.62/77,077.40
  6. Step 6: Final answer
    x = 31,379.70

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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.