Home / 20,987.42-28,963.02-11,555.96

Finding the Fourth Proportional to 20,987.42, 28,963.02 and 11,555.96

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Solution

The fourth proportional to 20,987.42, 28,963.02 and 11,555.96 is: 15,947.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.42 : 28,963.02 = 11,555.96 : x
  2. Step 2: Convert to fraction form
    20,987.42/28,963.02 = 11,555.96/x
  3. Step 3: Cross multiply
    20,987.42x = 28,963.02 × 11,555.96
  4. Step 4: Simplify right side
    20,987.42x = 334,695,500.60
  5. Step 5: Solve for x
    x = 334,695,500.60/20,987.42
  6. Step 6: Final answer
    x = 15,947.43

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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.