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Finding the Fourth Proportional to 79,989.78, 120,057.36 and 42,581.16

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Solution

The fourth proportional to 79,989.78, 120,057.36 and 42,581.16 is: 63,910.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,989.78 : 120,057.36 = 42,581.16 : x
  2. Step 2: Convert to fraction form
    79,989.78/120,057.36 = 42,581.16/x
  3. Step 3: Cross multiply
    79,989.78x = 120,057.36 × 42,581.16
  4. Step 4: Simplify right side
    79,989.78x = 5,112,181,655.34
  5. Step 5: Solve for x
    x = 5,112,181,655.34/79,989.78
  6. Step 6: Final answer
    x = 63,910.44

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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.