Home / 20,520-30,742.20-18,306.18

Finding the Fourth Proportional to 20,520, 30,742.20 and 18,306.18

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Solution

The fourth proportional to 20,520, 30,742.20 and 18,306.18 is: 27,425.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,520 : 30,742.20 = 18,306.18 : x
  2. Step 2: Convert to fraction form
    20,520/30,742.20 = 18,306.18/x
  3. Step 3: Cross multiply
    20,520x = 30,742.20 × 18,306.18
  4. Step 4: Simplify right side
    20,520x = 562,772,246.80
  5. Step 5: Solve for x
    x = 562,772,246.80/20,520
  6. Step 6: Final answer
    x = 27,425.55

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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.