Home / 20,987.82-28,962.15-11,556.18

Finding the Fourth Proportional to 20,987.82, 28,962.15 and 11,556.18

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Solution

The fourth proportional to 20,987.82, 28,962.15 and 11,556.18 is: 15,946.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.82 : 28,962.15 = 11,556.18 : x
  2. Step 2: Convert to fraction form
    20,987.82/28,962.15 = 11,556.18/x
  3. Step 3: Cross multiply
    20,987.82x = 28,962.15 × 11,556.18
  4. Step 4: Simplify right side
    20,987.82x = 334,691,818.59
  5. Step 5: Solve for x
    x = 334,691,818.59/20,987.82
  6. Step 6: Final answer
    x = 15,946.95

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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.