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Finding the Fourth Proportional to 27.55, 38.01 and 21.40

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Solution

The fourth proportional to 27.55, 38.01 and 21.40 is: 29.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.55 : 38.01 = 21.40 : x
  2. Step 2: Convert to fraction form
    27.55/38.01 = 21.40/x
  3. Step 3: Cross multiply
    27.55x = 38.01 × 21.40
  4. Step 4: Simplify right side
    27.55x = 813.41
  5. Step 5: Solve for x
    x = 813.41/27.55
  6. Step 6: Final answer
    x = 29.53

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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.