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Finding the Fourth Proportional to 72,686.80, 108,997.80 and 28,298.80

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Solution

The fourth proportional to 72,686.80, 108,997.80 and 28,298.80 is: 42,435.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,686.80 : 108,997.80 = 28,298.80 : x
  2. Step 2: Convert to fraction form
    72,686.80/108,997.80 = 28,298.80/x
  3. Step 3: Cross multiply
    72,686.80x = 108,997.80 × 28,298.80
  4. Step 4: Simplify right side
    72,686.80x = 3,084,506,942.64
  5. Step 5: Solve for x
    x = 3,084,506,942.64/72,686.80
  6. Step 6: Final answer
    x = 42,435.59

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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.