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Finding the Fourth Proportional to 42.17, 58.21 and 25.81

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Solution

The fourth proportional to 42.17, 58.21 and 25.81 is: 35.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.17 : 58.21 = 25.81 : x
  2. Step 2: Convert to fraction form
    42.17/58.21 = 25.81/x
  3. Step 3: Cross multiply
    42.17x = 58.21 × 25.81
  4. Step 4: Simplify right side
    42.17x = 1,502.19
  5. Step 5: Solve for x
    x = 1,502.19/42.17
  6. Step 6: Final answer
    x = 35.63

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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.