Home / 20,963.88-28,942.14-13,899.90

Finding the Fourth Proportional to 20,963.88, 28,942.14 and 13,899.90

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Solution

The fourth proportional to 20,963.88, 28,942.14 and 13,899.90 is: 19,189.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,963.88 : 28,942.14 = 13,899.90 : x
  2. Step 2: Convert to fraction form
    20,963.88/28,942.14 = 13,899.90/x
  3. Step 3: Cross multiply
    20,963.88x = 28,942.14 × 13,899.90
  4. Step 4: Simplify right side
    20,963.88x = 402,292,851.79
  5. Step 5: Solve for x
    x = 402,292,851.79/20,963.88
  6. Step 6: Final answer
    x = 19,189.81

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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.