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Finding the Fourth Proportional to 318.39, 477.05 and 208.58

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Solution

The fourth proportional to 318.39, 477.05 and 208.58 is: 312.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.39 : 477.05 = 208.58 : x
  2. Step 2: Convert to fraction form
    318.39/477.05 = 208.58/x
  3. Step 3: Cross multiply
    318.39x = 477.05 × 208.58
  4. Step 4: Simplify right side
    318.39x = 99,503.76
  5. Step 5: Solve for x
    x = 99,503.76/318.39
  6. Step 6: Final answer
    x = 312.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.