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Finding the Fourth Proportional to 209.78, 314.46 and 72.76

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Solution

The fourth proportional to 209.78, 314.46 and 72.76 is: 109.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.78 : 314.46 = 72.76 : x
  2. Step 2: Convert to fraction form
    209.78/314.46 = 72.76/x
  3. Step 3: Cross multiply
    209.78x = 314.46 × 72.76
  4. Step 4: Simplify right side
    209.78x = 22,880.11
  5. Step 5: Solve for x
    x = 22,880.11/209.78
  6. Step 6: Final answer
    x = 109.07

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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.