Home / 20,986.47-28,961.25-11,555.04

Finding the Fourth Proportional to 20,986.47, 28,961.25 and 11,555.04

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Solution

The fourth proportional to 20,986.47, 28,961.25 and 11,555.04 is: 15,945.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.47 : 28,961.25 = 11,555.04 : x
  2. Step 2: Convert to fraction form
    20,986.47/28,961.25 = 11,555.04/x
  3. Step 3: Cross multiply
    20,986.47x = 28,961.25 × 11,555.04
  4. Step 4: Simplify right side
    20,986.47x = 334,648,402.20
  5. Step 5: Solve for x
    x = 334,648,402.20/20,986.47
  6. Step 6: Final answer
    x = 15,945.91

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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.