Home / 20,987.84-28,963.68-11,556.92

Finding the Fourth Proportional to 20,987.84, 28,963.68 and 11,556.92

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Solution

The fourth proportional to 20,987.84, 28,963.68 and 11,556.92 is: 15,948.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.84 : 28,963.68 = 11,556.92 : x
  2. Step 2: Convert to fraction form
    20,987.84/28,963.68 = 11,556.92/x
  3. Step 3: Cross multiply
    20,987.84x = 28,963.68 × 11,556.92
  4. Step 4: Simplify right side
    20,987.84x = 334,730,932.67
  5. Step 5: Solve for x
    x = 334,730,932.67/20,987.84
  6. Step 6: Final answer
    x = 15,948.80

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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.