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Finding the Fourth Proportional to 45.06, 67.31 and 38.58

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Solution

The fourth proportional to 45.06, 67.31 and 38.58 is: 57.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.06 : 67.31 = 38.58 : x
  2. Step 2: Convert to fraction form
    45.06/67.31 = 38.58/x
  3. Step 3: Cross multiply
    45.06x = 67.31 × 38.58
  4. Step 4: Simplify right side
    45.06x = 2,596.63
  5. Step 5: Solve for x
    x = 2,596.63/45.06
  6. Step 6: Final answer
    x = 57.63

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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.