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Finding the Fourth Proportional to 19,395.25, 26,778 and 15,138.97

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Solution

The fourth proportional to 19,395.25, 26,778 and 15,138.97 is: 20,901.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,395.25 : 26,778 = 15,138.97 : x
  2. Step 2: Convert to fraction form
    19,395.25/26,778 = 15,138.97/x
  3. Step 3: Cross multiply
    19,395.25x = 26,778 × 15,138.97
  4. Step 4: Simplify right side
    19,395.25x = 405,391,338.66
  5. Step 5: Solve for x
    x = 405,391,338.66/19,395.25
  6. Step 6: Final answer
    x = 20,901.58

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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.