Home / 20,988.23-28,963.68-11,556.78

Finding the Fourth Proportional to 20,988.23, 28,963.68 and 11,556.78

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Solution

The fourth proportional to 20,988.23, 28,963.68 and 11,556.78 is: 15,948.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.23 : 28,963.68 = 11,556.78 : x
  2. Step 2: Convert to fraction form
    20,988.23/28,963.68 = 11,556.78/x
  3. Step 3: Cross multiply
    20,988.23x = 28,963.68 × 11,556.78
  4. Step 4: Simplify right side
    20,988.23x = 334,726,877.75
  5. Step 5: Solve for x
    x = 334,726,877.75/20,988.23
  6. Step 6: Final answer
    x = 15,948.32

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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.