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Finding the Fourth Proportional to 17,970.60, 26,891.10 and 12,138.60

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Solution

The fourth proportional to 17,970.60, 26,891.10 and 12,138.60 is: 18,164.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,970.60 : 26,891.10 = 12,138.60 : x
  2. Step 2: Convert to fraction form
    17,970.60/26,891.10 = 12,138.60/x
  3. Step 3: Cross multiply
    17,970.60x = 26,891.10 × 12,138.60
  4. Step 4: Simplify right side
    17,970.60x = 326,420,306.46
  5. Step 5: Solve for x
    x = 326,420,306.46/17,970.60
  6. Step 6: Final answer
    x = 18,164.13

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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.