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Finding the Fourth Proportional to 72,751.20, 100,388.52 and 40,919.40

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Solution

The fourth proportional to 72,751.20, 100,388.52 and 40,919.40 is: 56,464.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,751.20 : 100,388.52 = 40,919.40 : x
  2. Step 2: Convert to fraction form
    72,751.20/100,388.52 = 40,919.40/x
  3. Step 3: Cross multiply
    72,751.20x = 100,388.52 × 40,919.40
  4. Step 4: Simplify right side
    72,751.20x = 4,107,838,005.29
  5. Step 5: Solve for x
    x = 4,107,838,005.29/72,751.20
  6. Step 6: Final answer
    x = 56,464.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.