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Finding the Fourth Proportional to 278.14, 383.51 and 208.08

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Solution

The fourth proportional to 278.14, 383.51 and 208.08 is: 286.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.14 : 383.51 = 208.08 : x
  2. Step 2: Convert to fraction form
    278.14/383.51 = 208.08/x
  3. Step 3: Cross multiply
    278.14x = 383.51 × 208.08
  4. Step 4: Simplify right side
    278.14x = 79,800.76
  5. Step 5: Solve for x
    x = 79,800.76/278.14
  6. Step 6: Final answer
    x = 286.91

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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.