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Finding the Fourth Proportional to 72,213.80, 108,320.70 and 65,652.80

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Solution

The fourth proportional to 72,213.80, 108,320.70 and 65,652.80 is: 98,479.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,213.80 : 108,320.70 = 65,652.80 : x
  2. Step 2: Convert to fraction form
    72,213.80/108,320.70 = 65,652.80/x
  3. Step 3: Cross multiply
    72,213.80x = 108,320.70 × 65,652.80
  4. Step 4: Simplify right side
    72,213.80x = 7,111,557,252.96
  5. Step 5: Solve for x
    x = 7,111,557,252.96/72,213.80
  6. Step 6: Final answer
    x = 98,479.20

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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.