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Finding the Fourth Proportional to 209.54, 314.35 and 72.58

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Solution

The fourth proportional to 209.54, 314.35 and 72.58 is: 108.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.54 : 314.35 = 72.58 : x
  2. Step 2: Convert to fraction form
    209.54/314.35 = 72.58/x
  3. Step 3: Cross multiply
    209.54x = 314.35 × 72.58
  4. Step 4: Simplify right side
    209.54x = 22,815.52
  5. Step 5: Solve for x
    x = 22,815.52/209.54
  6. Step 6: Final answer
    x = 108.88

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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.