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Finding the Fourth Proportional to 25.55, 38.13 and 25.40

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Solution

The fourth proportional to 25.55, 38.13 and 25.40 is: 37.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.55 : 38.13 = 25.40 : x
  2. Step 2: Convert to fraction form
    25.55/38.13 = 25.40/x
  3. Step 3: Cross multiply
    25.55x = 38.13 × 25.40
  4. Step 4: Simplify right side
    25.55x = 968.38
  5. Step 5: Solve for x
    x = 968.38/25.55
  6. Step 6: Final answer
    x = 37.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.