Home / 20,719.78-31,079.44-12,402.11

Finding the Fourth Proportional to 20,719.78, 31,079.44 and 12,402.11

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Solution

The fourth proportional to 20,719.78, 31,079.44 and 12,402.11 is: 18,603.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.78 : 31,079.44 = 12,402.11 : x
  2. Step 2: Convert to fraction form
    20,719.78/31,079.44 = 12,402.11/x
  3. Step 3: Cross multiply
    20,719.78x = 31,079.44 × 12,402.11
  4. Step 4: Simplify right side
    20,719.78x = 385,450,700.76
  5. Step 5: Solve for x
    x = 385,450,700.76/20,719.78
  6. Step 6: Final answer
    x = 18,603.03

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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.