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Finding the Fourth Proportional to 318.08, 439.01 and 235.61

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Solution

The fourth proportional to 318.08, 439.01 and 235.61 is: 325.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.08 : 439.01 = 235.61 : x
  2. Step 2: Convert to fraction form
    318.08/439.01 = 235.61/x
  3. Step 3: Cross multiply
    318.08x = 439.01 × 235.61
  4. Step 4: Simplify right side
    318.08x = 103,431.77
  5. Step 5: Solve for x
    x = 103,431.77/318.08
  6. Step 6: Final answer
    x = 325.18

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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.