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Finding the Fourth Proportional to 42.58, 63.82 and 31.14

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Solution

The fourth proportional to 42.58, 63.82 and 31.14 is: 46.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.58 : 63.82 = 31.14 : x
  2. Step 2: Convert to fraction form
    42.58/63.82 = 31.14/x
  3. Step 3: Cross multiply
    42.58x = 63.82 × 31.14
  4. Step 4: Simplify right side
    42.58x = 1,987.35
  5. Step 5: Solve for x
    x = 1,987.35/42.58
  6. Step 6: Final answer
    x = 46.67

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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.