Home / 78,109.96-117,115.76-66,267.88

Finding the Fourth Proportional to 78,109.96, 117,115.76 and 66,267.88

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Solution

The fourth proportional to 78,109.96, 117,115.76 and 66,267.88 is: 99,360.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,109.96 : 117,115.76 = 66,267.88 : x
  2. Step 2: Convert to fraction form
    78,109.96/117,115.76 = 66,267.88/x
  3. Step 3: Cross multiply
    78,109.96x = 117,115.76 × 66,267.88
  4. Step 4: Simplify right side
    78,109.96x = 7,761,013,129.79
  5. Step 5: Solve for x
    x = 7,761,013,129.79/78,109.96
  6. Step 6: Final answer
    x = 99,360.10

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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.