Home / 20,987.12-28,962.42-11,555.76

Finding the Fourth Proportional to 20,987.12, 28,962.42 and 11,555.76

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Solution

The fourth proportional to 20,987.12, 28,962.42 and 11,555.76 is: 15,947.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.12 : 28,962.42 = 11,555.76 : x
  2. Step 2: Convert to fraction form
    20,987.12/28,962.42 = 11,555.76/x
  3. Step 3: Cross multiply
    20,987.12x = 28,962.42 × 11,555.76
  4. Step 4: Simplify right side
    20,987.12x = 334,682,774.54
  5. Step 5: Solve for x
    x = 334,682,774.54/20,987.12
  6. Step 6: Final answer
    x = 15,947.06

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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.