Home / 20,898.55-31,375.65-12,139.75

Finding the Fourth Proportional to 20,898.55, 31,375.65 and 12,139.75

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Solution

The fourth proportional to 20,898.55, 31,375.65 and 12,139.75 is: 18,225.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,898.55 : 31,375.65 = 12,139.75 : x
  2. Step 2: Convert to fraction form
    20,898.55/31,375.65 = 12,139.75/x
  3. Step 3: Cross multiply
    20,898.55x = 31,375.65 × 12,139.75
  4. Step 4: Simplify right side
    20,898.55x = 380,892,547.09
  5. Step 5: Solve for x
    x = 380,892,547.09/20,898.55
  6. Step 6: Final answer
    x = 18,225.79

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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.