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Finding the Fourth Proportional to 72,431.65, 99,955.91 and 40,168.58

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Solution

The fourth proportional to 72,431.65, 99,955.91 and 40,168.58 is: 55,432.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,431.65 : 99,955.91 = 40,168.58 : x
  2. Step 2: Convert to fraction form
    72,431.65/99,955.91 = 40,168.58/x
  3. Step 3: Cross multiply
    72,431.65x = 99,955.91 × 40,168.58
  4. Step 4: Simplify right side
    72,431.65x = 4,015,086,567.95
  5. Step 5: Solve for x
    x = 4,015,086,567.95/72,431.65
  6. Step 6: Final answer
    x = 55,432.76

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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.