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Finding the Fourth Proportional to 25.90, 39.00 and 21.88

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Solution

The fourth proportional to 25.90, 39.00 and 21.88 is: 32.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.90 : 39.00 = 21.88 : x
  2. Step 2: Convert to fraction form
    25.90/39.00 = 21.88/x
  3. Step 3: Cross multiply
    25.90x = 39.00 × 21.88
  4. Step 4: Simplify right side
    25.90x = 853.02
  5. Step 5: Solve for x
    x = 853.02/25.90
  6. Step 6: Final answer
    x = 32.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.