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Finding the Fourth Proportional to 25.09, 34.61 and 15.87

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Solution

The fourth proportional to 25.09, 34.61 and 15.87 is: 21.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.09 : 34.61 = 15.87 : x
  2. Step 2: Convert to fraction form
    25.09/34.61 = 15.87/x
  3. Step 3: Cross multiply
    25.09x = 34.61 × 15.87
  4. Step 4: Simplify right side
    25.09x = 549.22
  5. Step 5: Solve for x
    x = 549.22/25.09
  6. Step 6: Final answer
    x = 21.89

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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.