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Finding the Fourth Proportional to 72,449.76, 99,980.40 and 40,618.64

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Solution

The fourth proportional to 72,449.76, 99,980.40 and 40,618.64 is: 56,053.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,449.76 : 99,980.40 = 40,618.64 : x
  2. Step 2: Convert to fraction form
    72,449.76/99,980.40 = 40,618.64/x
  3. Step 3: Cross multiply
    72,449.76x = 99,980.40 × 40,618.64
  4. Step 4: Simplify right side
    72,449.76x = 4,061,067,874.66
  5. Step 5: Solve for x
    x = 4,061,067,874.66/72,449.76
  6. Step 6: Final answer
    x = 56,053.57

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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.