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Finding the Fourth Proportional to 19,855.40, 27,398.40 and 11,897.42

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Solution

The fourth proportional to 19,855.40, 27,398.40 and 11,897.42 is: 16,417.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,855.40 : 27,398.40 = 11,897.42 : x
  2. Step 2: Convert to fraction form
    19,855.40/27,398.40 = 11,897.42/x
  3. Step 3: Cross multiply
    19,855.40x = 27,398.40 × 11,897.42
  4. Step 4: Simplify right side
    19,855.40x = 325,970,135.14
  5. Step 5: Solve for x
    x = 325,970,135.14/19,855.40
  6. Step 6: Final answer
    x = 16,417.21

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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.