Home / 20,988.39-28,963.80-11,556.75

Finding the Fourth Proportional to 20,988.39, 28,963.80 and 11,556.75

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Solution

The fourth proportional to 20,988.39, 28,963.80 and 11,556.75 is: 15,948.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.39 : 28,963.80 = 11,556.75 : x
  2. Step 2: Convert to fraction form
    20,988.39/28,963.80 = 11,556.75/x
  3. Step 3: Cross multiply
    20,988.39x = 28,963.80 × 11,556.75
  4. Step 4: Simplify right side
    20,988.39x = 334,727,395.65
  5. Step 5: Solve for x
    x = 334,727,395.65/20,988.39
  6. Step 6: Final answer
    x = 15,948.22

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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.