Home / 20,515.78-28,311.53-11,563.36

Finding the Fourth Proportional to 20,515.78, 28,311.53 and 11,563.36

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Solution

The fourth proportional to 20,515.78, 28,311.53 and 11,563.36 is: 15,957.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.78 : 28,311.53 = 11,563.36 : x
  2. Step 2: Convert to fraction form
    20,515.78/28,311.53 = 11,563.36/x
  3. Step 3: Cross multiply
    20,515.78x = 28,311.53 × 11,563.36
  4. Step 4: Simplify right side
    20,515.78x = 327,376,284.95
  5. Step 5: Solve for x
    x = 327,376,284.95/20,515.78
  6. Step 6: Final answer
    x = 15,957.29

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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.