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Finding the Fourth Proportional to 19,398.96, 26,781.48 and 12,691.44

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Solution

The fourth proportional to 19,398.96, 26,781.48 and 12,691.44 is: 17,521.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,398.96 : 26,781.48 = 12,691.44 : x
  2. Step 2: Convert to fraction form
    19,398.96/26,781.48 = 12,691.44/x
  3. Step 3: Cross multiply
    19,398.96x = 26,781.48 × 12,691.44
  4. Step 4: Simplify right side
    19,398.96x = 339,895,546.53
  5. Step 5: Solve for x
    x = 339,895,546.53/19,398.96
  6. Step 6: Final answer
    x = 17,521.33

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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.