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Finding the Fourth Proportional to 318.18, 439.08 and 187.18

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Solution

The fourth proportional to 318.18, 439.08 and 187.18 is: 258.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.18 : 439.08 = 187.18 : x
  2. Step 2: Convert to fraction form
    318.18/439.08 = 187.18/x
  3. Step 3: Cross multiply
    318.18x = 439.08 × 187.18
  4. Step 4: Simplify right side
    318.18x = 82,186.99
  5. Step 5: Solve for x
    x = 82,186.99/318.18
  6. Step 6: Final answer
    x = 258.30

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.