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Finding the Fourth Proportional to 25.30, 37.81 and 21.45

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Solution

The fourth proportional to 25.30, 37.81 and 21.45 is: 32.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.30 : 37.81 = 21.45 : x
  2. Step 2: Convert to fraction form
    25.30/37.81 = 21.45/x
  3. Step 3: Cross multiply
    25.30x = 37.81 × 21.45
  4. Step 4: Simplify right side
    25.30x = 811.02
  5. Step 5: Solve for x
    x = 811.02/25.30
  6. Step 6: Final answer
    x = 32.06

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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.