Home / 20,321.53-28,053.30-15,287.67

Finding the Fourth Proportional to 20,321.53, 28,053.30 and 15,287.67

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Solution

The fourth proportional to 20,321.53, 28,053.30 and 15,287.67 is: 21,104.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,321.53 : 28,053.30 = 15,287.67 : x
  2. Step 2: Convert to fraction form
    20,321.53/28,053.30 = 15,287.67/x
  3. Step 3: Cross multiply
    20,321.53x = 28,053.30 × 15,287.67
  4. Step 4: Simplify right side
    20,321.53x = 428,869,631.03
  5. Step 5: Solve for x
    x = 428,869,631.03/20,321.53
  6. Step 6: Final answer
    x = 21,104.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.