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Finding the Fourth Proportional to 72,061.53, 107,619.20 and 61,418.13

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Solution

The fourth proportional to 72,061.53, 107,619.20 and 61,418.13 is: 91,723.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,061.53 : 107,619.20 = 61,418.13 : x
  2. Step 2: Convert to fraction form
    72,061.53/107,619.20 = 61,418.13/x
  3. Step 3: Cross multiply
    72,061.53x = 107,619.20 × 61,418.13
  4. Step 4: Simplify right side
    72,061.53x = 6,609,770,458.05
  5. Step 5: Solve for x
    x = 6,609,770,458.05/72,061.53
  6. Step 6: Final answer
    x = 91,723.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.