Home / 20,987.13-31,480.70-7,136.13

Finding the Fourth Proportional to 20,987.13, 31,480.70 and 7,136.13

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Solution

The fourth proportional to 20,987.13, 31,480.70 and 7,136.13 is: 10,704.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.13 : 31,480.70 = 7,136.13 : x
  2. Step 2: Convert to fraction form
    20,987.13/31,480.70 = 7,136.13/x
  3. Step 3: Cross multiply
    20,987.13x = 31,480.70 × 7,136.13
  4. Step 4: Simplify right side
    20,987.13x = 224,650,367.69
  5. Step 5: Solve for x
    x = 224,650,367.69/20,987.13
  6. Step 6: Final answer
    x = 10,704.20

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1.5x scale

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.