Home / 20,515.14-28,283.47-15,388.86

Finding the Fourth Proportional to 20,515.14, 28,283.47 and 15,388.86

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Solution

The fourth proportional to 20,515.14, 28,283.47 and 15,388.86 is: 21,216.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.14 : 28,283.47 = 15,388.86 : x
  2. Step 2: Convert to fraction form
    20,515.14/28,283.47 = 15,388.86/x
  3. Step 3: Cross multiply
    20,515.14x = 28,283.47 × 15,388.86
  4. Step 4: Simplify right side
    20,515.14x = 435,250,321.67
  5. Step 5: Solve for x
    x = 435,250,321.67/20,515.14
  6. Step 6: Final answer
    x = 21,216.05

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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.