Home / 20,987.89-28,963.23-11,556.46

Finding the Fourth Proportional to 20,987.89, 28,963.23 and 11,556.46

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Solution

The fourth proportional to 20,987.89, 28,963.23 and 11,556.46 is: 15,947.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.89 : 28,963.23 = 11,556.46 : x
  2. Step 2: Convert to fraction form
    20,987.89/28,963.23 = 11,556.46/x
  3. Step 3: Cross multiply
    20,987.89x = 28,963.23 × 11,556.46
  4. Step 4: Simplify right side
    20,987.89x = 334,712,408.97
  5. Step 5: Solve for x
    x = 334,712,408.97/20,987.89
  6. Step 6: Final answer
    x = 15,947.88

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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.