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Finding the Fourth Proportional to 30.31, 41.79 and 25.39

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Solution

The fourth proportional to 30.31, 41.79 and 25.39 is: 35.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.31 : 41.79 = 25.39 : x
  2. Step 2: Convert to fraction form
    30.31/41.79 = 25.39/x
  3. Step 3: Cross multiply
    30.31x = 41.79 × 25.39
  4. Step 4: Simplify right side
    30.31x = 1,061.05
  5. Step 5: Solve for x
    x = 1,061.05/30.31
  6. Step 6: Final answer
    x = 35.01

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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.