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Finding the Fourth Proportional to 20,291.44, 28,020 and 12,750.84

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Solution

The fourth proportional to 20,291.44, 28,020 and 12,750.84 is: 17,607.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,291.44 : 28,020 = 12,750.84 : x
  2. Step 2: Convert to fraction form
    20,291.44/28,020 = 12,750.84/x
  3. Step 3: Cross multiply
    20,291.44x = 28,020 × 12,750.84
  4. Step 4: Simplify right side
    20,291.44x = 357,278,536.80
  5. Step 5: Solve for x
    x = 357,278,536.80/20,291.44
  6. Step 6: Final answer
    x = 17,607.35

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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.