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Finding the Fourth Proportional to 66,489.51, 91,815.89 and 49,487.55

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Solution

The fourth proportional to 66,489.51, 91,815.89 and 49,487.55 is: 68,337.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.51 : 91,815.89 = 49,487.55 : x
  2. Step 2: Convert to fraction form
    66,489.51/91,815.89 = 49,487.55/x
  3. Step 3: Cross multiply
    66,489.51x = 91,815.89 × 49,487.55
  4. Step 4: Simplify right side
    66,489.51x = 4,543,743,447.17
  5. Step 5: Solve for x
    x = 4,543,743,447.17/66,489.51
  6. Step 6: Final answer
    x = 68,337.75

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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.