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Finding the Fourth Proportional to 72,002.80, 108,004.22 and 64,421.20

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Solution

The fourth proportional to 72,002.80, 108,004.22 and 64,421.20 is: 96,631.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,002.80 : 108,004.22 = 64,421.20 : x
  2. Step 2: Convert to fraction form
    72,002.80/108,004.22 = 64,421.20/x
  3. Step 3: Cross multiply
    72,002.80x = 108,004.22 × 64,421.20
  4. Step 4: Simplify right side
    72,002.80x = 6,957,761,457.46
  5. Step 5: Solve for x
    x = 6,957,761,457.46/72,002.80
  6. Step 6: Final answer
    x = 96,631.82

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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.