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Finding the Fourth Proportional to 91,993.45, 138,043.71 and 38,681.57

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Solution

The fourth proportional to 91,993.45, 138,043.71 and 38,681.57 is: 58,044.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,993.45 : 138,043.71 = 38,681.57 : x
  2. Step 2: Convert to fraction form
    91,993.45/138,043.71 = 38,681.57/x
  3. Step 3: Cross multiply
    91,993.45x = 138,043.71 × 38,681.57
  4. Step 4: Simplify right side
    91,993.45x = 5,339,746,741.21
  5. Step 5: Solve for x
    x = 5,339,746,741.21/91,993.45
  6. Step 6: Final answer
    x = 58,044.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.