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Finding the Fourth Proportional to 73,008.40, 109,431.60 and 28,620.40

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Solution

The fourth proportional to 73,008.40, 109,431.60 and 28,620.40 is: 42,898.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,008.40 : 109,431.60 = 28,620.40 : x
  2. Step 2: Convert to fraction form
    73,008.40/109,431.60 = 28,620.40/x
  3. Step 3: Cross multiply
    73,008.40x = 109,431.60 × 28,620.40
  4. Step 4: Simplify right side
    73,008.40x = 3,131,976,164.64
  5. Step 5: Solve for x
    x = 3,131,976,164.64/73,008.40
  6. Step 6: Final answer
    x = 42,898.85

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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.