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Finding the Fourth Proportional to 25.43, 38.15 and 7.40

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Solution

The fourth proportional to 25.43, 38.15 and 7.40 is: 11.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.43 : 38.15 = 7.40 : x
  2. Step 2: Convert to fraction form
    25.43/38.15 = 7.40/x
  3. Step 3: Cross multiply
    25.43x = 38.15 × 7.40
  4. Step 4: Simplify right side
    25.43x = 282.08
  5. Step 5: Solve for x
    x = 282.08/25.43
  6. Step 6: Final answer
    x = 11.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.