Home / 78,048.20-117,072.30-76,881.80

Finding the Fourth Proportional to 78,048.20, 117,072.30 and 76,881.80

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Solution

The fourth proportional to 78,048.20, 117,072.30 and 76,881.80 is: 115,322.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,048.20 : 117,072.30 = 76,881.80 : x
  2. Step 2: Convert to fraction form
    78,048.20/117,072.30 = 76,881.80/x
  3. Step 3: Cross multiply
    78,048.20x = 117,072.30 × 76,881.80
  4. Step 4: Simplify right side
    78,048.20x = 9,000,729,154.14
  5. Step 5: Solve for x
    x = 9,000,729,154.14/78,048.20
  6. Step 6: Final answer
    x = 115,322.70

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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.