Home / 20,987.92-28,963.72-11,557.20

Finding the Fourth Proportional to 20,987.92, 28,963.72 and 11,557.20

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Solution

The fourth proportional to 20,987.92, 28,963.72 and 11,557.20 is: 15,949.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.92 : 28,963.72 = 11,557.20 : x
  2. Step 2: Convert to fraction form
    20,987.92/28,963.72 = 11,557.20/x
  3. Step 3: Cross multiply
    20,987.92x = 28,963.72 × 11,557.20
  4. Step 4: Simplify right side
    20,987.92x = 334,739,504.78
  5. Step 5: Solve for x
    x = 334,739,504.78/20,987.92
  6. Step 6: Final answer
    x = 15,949.15

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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.