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Finding the Fourth Proportional to 18,937.89, 26,109.99 and 12,959.28

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Solution

The fourth proportional to 18,937.89, 26,109.99 and 12,959.28 is: 17,867.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,937.89 : 26,109.99 = 12,959.28 : x
  2. Step 2: Convert to fraction form
    18,937.89/26,109.99 = 12,959.28/x
  3. Step 3: Cross multiply
    18,937.89x = 26,109.99 × 12,959.28
  4. Step 4: Simplify right side
    18,937.89x = 338,366,671.21
  5. Step 5: Solve for x
    x = 338,366,671.21/18,937.89
  6. Step 6: Final answer
    x = 17,867.18

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.