Home / 20,988.50-28,964.13-11,556.86

Finding the Fourth Proportional to 20,988.50, 28,964.13 and 11,556.86

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Solution

The fourth proportional to 20,988.50, 28,964.13 and 11,556.86 is: 15,948.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.50 : 28,964.13 = 11,556.86 : x
  2. Step 2: Convert to fraction form
    20,988.50/28,964.13 = 11,556.86/x
  3. Step 3: Cross multiply
    20,988.50x = 28,964.13 × 11,556.86
  4. Step 4: Simplify right side
    20,988.50x = 334,734,395.43
  5. Step 5: Solve for x
    x = 334,734,395.43/20,988.50
  6. Step 6: Final answer
    x = 15,948.47

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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.