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Finding the Fourth Proportional to 72,443.80, 108,665.70 and 64,133.20

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Solution

The fourth proportional to 72,443.80, 108,665.70 and 64,133.20 is: 96,199.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,443.80 : 108,665.70 = 64,133.20 : x
  2. Step 2: Convert to fraction form
    72,443.80/108,665.70 = 64,133.20/x
  3. Step 3: Cross multiply
    72,443.80x = 108,665.70 × 64,133.20
  4. Step 4: Simplify right side
    72,443.80x = 6,969,079,071.24
  5. Step 5: Solve for x
    x = 6,969,079,071.24/72,443.80
  6. Step 6: Final answer
    x = 96,199.80

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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.