Home / 20,780.40-31,247.40-17,401.20

Finding the Fourth Proportional to 20,780.40, 31,247.40 and 17,401.20

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Solution

The fourth proportional to 20,780.40, 31,247.40 and 17,401.20 is: 26,166.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.40 : 31,247.40 = 17,401.20 : x
  2. Step 2: Convert to fraction form
    20,780.40/31,247.40 = 17,401.20/x
  3. Step 3: Cross multiply
    20,780.40x = 31,247.40 × 17,401.20
  4. Step 4: Simplify right side
    20,780.40x = 543,742,256.88
  5. Step 5: Solve for x
    x = 543,742,256.88/20,780.40
  6. Step 6: Final answer
    x = 26,166.11

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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.