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Finding the Fourth Proportional to 27.96, 38.55 and 21.03

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Solution

The fourth proportional to 27.96, 38.55 and 21.03 is: 29.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.96 : 38.55 = 21.03 : x
  2. Step 2: Convert to fraction form
    27.96/38.55 = 21.03/x
  3. Step 3: Cross multiply
    27.96x = 38.55 × 21.03
  4. Step 4: Simplify right side
    27.96x = 810.71
  5. Step 5: Solve for x
    x = 810.71/27.96
  6. Step 6: Final answer
    x = 29.00

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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.