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Finding the Fourth Proportional to 318.81, 440.04 and 206.77

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Solution

The fourth proportional to 318.81, 440.04 and 206.77 is: 285.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.81 : 440.04 = 206.77 : x
  2. Step 2: Convert to fraction form
    318.81/440.04 = 206.77/x
  3. Step 3: Cross multiply
    318.81x = 440.04 × 206.77
  4. Step 4: Simplify right side
    318.81x = 90,988.40
  5. Step 5: Solve for x
    x = 90,988.40/318.81
  6. Step 6: Final answer
    x = 285.40

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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.