Home / 20,987.42-28,963.14-11,427.80

Finding the Fourth Proportional to 20,987.42, 28,963.14 and 11,427.80

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Solution

The fourth proportional to 20,987.42, 28,963.14 and 11,427.80 is: 15,770.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.42 : 28,963.14 = 11,427.80 : x
  2. Step 2: Convert to fraction form
    20,987.42/28,963.14 = 11,427.80/x
  3. Step 3: Cross multiply
    20,987.42x = 28,963.14 × 11,427.80
  4. Step 4: Simplify right side
    20,987.42x = 330,984,971.29
  5. Step 5: Solve for x
    x = 330,984,971.29/20,987.42
  6. Step 6: Final answer
    x = 15,770.64

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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.