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Finding the Fourth Proportional to 40,456.80, 60,697.16 and 20,749.20

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Solution

The fourth proportional to 40,456.80, 60,697.16 and 20,749.20 is: 31,129.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,456.80 : 60,697.16 = 20,749.20 : x
  2. Step 2: Convert to fraction form
    40,456.80/60,697.16 = 20,749.20/x
  3. Step 3: Cross multiply
    40,456.80x = 60,697.16 × 20,749.20
  4. Step 4: Simplify right side
    40,456.80x = 1,259,417,512.27
  5. Step 5: Solve for x
    x = 1,259,417,512.27/40,456.80
  6. Step 6: Final answer
    x = 31,129.93

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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.