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Finding the Fourth Proportional to 60,112.79, 90,173.87 and 20,131.91

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Solution

The fourth proportional to 60,112.79, 90,173.87 and 20,131.91 is: 30,199.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,112.79 : 90,173.87 = 20,131.91 : x
  2. Step 2: Convert to fraction form
    60,112.79/90,173.87 = 20,131.91/x
  3. Step 3: Cross multiply
    60,112.79x = 90,173.87 × 20,131.91
  4. Step 4: Simplify right side
    60,112.79x = 1,815,371,683.66
  5. Step 5: Solve for x
    x = 1,815,371,683.66/60,112.79
  6. Step 6: Final answer
    x = 30,199.43

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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.