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Finding the Fourth Proportional to 18,815.97, 28,218.20 and 13,009.89

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Solution

The fourth proportional to 18,815.97, 28,218.20 and 13,009.89 is: 19,510.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.97 : 28,218.20 = 13,009.89 : x
  2. Step 2: Convert to fraction form
    18,815.97/28,218.20 = 13,009.89/x
  3. Step 3: Cross multiply
    18,815.97x = 28,218.20 × 13,009.89
  4. Step 4: Simplify right side
    18,815.97x = 367,115,612.95
  5. Step 5: Solve for x
    x = 367,115,612.95/18,815.97
  6. Step 6: Final answer
    x = 19,510.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.