Home / 20,918.28-31,374.18-6,123.72

Finding the Fourth Proportional to 20,918.28, 31,374.18 and 6,123.72

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Solution

The fourth proportional to 20,918.28, 31,374.18 and 6,123.72 is: 9,184.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.28 : 31,374.18 = 6,123.72 : x
  2. Step 2: Convert to fraction form
    20,918.28/31,374.18 = 6,123.72/x
  3. Step 3: Cross multiply
    20,918.28x = 31,374.18 × 6,123.72
  4. Step 4: Simplify right side
    20,918.28x = 192,126,693.55
  5. Step 5: Solve for x
    x = 192,126,693.55/20,918.28
  6. Step 6: Final answer
    x = 9,184.63

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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.