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Finding the Fourth Proportional to 20,791.66, 28,689.12 and 12,836.46

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Solution

The fourth proportional to 20,791.66, 28,689.12 and 12,836.46 is: 17,712.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.66 : 28,689.12 = 12,836.46 : x
  2. Step 2: Convert to fraction form
    20,791.66/28,689.12 = 12,836.46/x
  3. Step 3: Cross multiply
    20,791.66x = 28,689.12 × 12,836.46
  4. Step 4: Simplify right side
    20,791.66x = 368,266,741.32
  5. Step 5: Solve for x
    x = 368,266,741.32/20,791.66
  6. Step 6: Final answer
    x = 17,712.23

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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.