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Finding the Fourth Proportional to 91,987.85, 137,981.78 and 28,812.91

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Solution

The fourth proportional to 91,987.85, 137,981.78 and 28,812.91 is: 43,219.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,987.85 : 137,981.78 = 28,812.91 : x
  2. Step 2: Convert to fraction form
    91,987.85/137,981.78 = 28,812.91/x
  3. Step 3: Cross multiply
    91,987.85x = 137,981.78 × 28,812.91
  4. Step 4: Simplify right side
    91,987.85x = 3,975,656,608.78
  5. Step 5: Solve for x
    x = 3,975,656,608.78/91,987.85
  6. Step 6: Final answer
    x = 43,219.37

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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.