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Finding the Fourth Proportional to 72,879.75, 100,581.21 and 42,663.24

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Solution

The fourth proportional to 72,879.75, 100,581.21 and 42,663.24 is: 58,879.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,879.75 : 100,581.21 = 42,663.24 : x
  2. Step 2: Convert to fraction form
    72,879.75/100,581.21 = 42,663.24/x
  3. Step 3: Cross multiply
    72,879.75x = 100,581.21 × 42,663.24
  4. Step 4: Simplify right side
    72,879.75x = 4,291,120,301.72
  5. Step 5: Solve for x
    x = 4,291,120,301.72/72,879.75
  6. Step 6: Final answer
    x = 58,879.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.