Home / 20,981.12-31,478.34-6,190.11

Finding the Fourth Proportional to 20,981.12, 31,478.34 and 6,190.11

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Solution

The fourth proportional to 20,981.12, 31,478.34 and 6,190.11 is: 9,287.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.12 : 31,478.34 = 6,190.11 : x
  2. Step 2: Convert to fraction form
    20,981.12/31,478.34 = 6,190.11/x
  3. Step 3: Cross multiply
    20,981.12x = 31,478.34 × 6,190.11
  4. Step 4: Simplify right side
    20,981.12x = 194,854,387.22
  5. Step 5: Solve for x
    x = 194,854,387.22/20,981.12
  6. Step 6: Final answer
    x = 9,287.13

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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.