Home / 31,387.50-43,318.60-18,139.50

Finding the Fourth Proportional to 31,387.50, 43,318.60 and 18,139.50

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Solution

The fourth proportional to 31,387.50, 43,318.60 and 18,139.50 is: 25,034.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,387.50 : 43,318.60 = 18,139.50 : x
  2. Step 2: Convert to fraction form
    31,387.50/43,318.60 = 18,139.50/x
  3. Step 3: Cross multiply
    31,387.50x = 43,318.60 × 18,139.50
  4. Step 4: Simplify right side
    31,387.50x = 785,777,744.70
  5. Step 5: Solve for x
    x = 785,777,744.70/31,387.50
  6. Step 6: Final answer
    x = 25,034.73

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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.