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Finding the Fourth Proportional to 318.19, 438.95 and 187.14

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Solution

The fourth proportional to 318.19, 438.95 and 187.14 is: 258.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.19 : 438.95 = 187.14 : x
  2. Step 2: Convert to fraction form
    318.19/438.95 = 187.14/x
  3. Step 3: Cross multiply
    318.19x = 438.95 × 187.14
  4. Step 4: Simplify right side
    318.19x = 82,145.10
  5. Step 5: Solve for x
    x = 82,145.10/318.19
  6. Step 6: Final answer
    x = 258.16

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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.