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Finding the Fourth Proportional to 72,408.80, 108,661.80 and 42,795.20

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Solution

The fourth proportional to 72,408.80, 108,661.80 and 42,795.20 is: 64,221.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,408.80 : 108,661.80 = 42,795.20 : x
  2. Step 2: Convert to fraction form
    72,408.80/108,661.80 = 42,795.20/x
  3. Step 3: Cross multiply
    72,408.80x = 108,661.80 × 42,795.20
  4. Step 4: Simplify right side
    72,408.80x = 4,650,203,463.36
  5. Step 5: Solve for x
    x = 4,650,203,463.36/72,408.80
  6. Step 6: Final answer
    x = 64,221.52

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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.