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Finding the Fourth Proportional to 318.40, 439.53 and 194.08

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Solution

The fourth proportional to 318.40, 439.53 and 194.08 is: 267.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.40 : 439.53 = 194.08 : x
  2. Step 2: Convert to fraction form
    318.40/439.53 = 194.08/x
  3. Step 3: Cross multiply
    318.40x = 439.53 × 194.08
  4. Step 4: Simplify right side
    318.40x = 85,303.98
  5. Step 5: Solve for x
    x = 85,303.98/318.40
  6. Step 6: Final answer
    x = 267.91

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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.