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Finding the Fourth Proportional to 209.31, 314.02 and 79.31

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Solution

The fourth proportional to 209.31, 314.02 and 79.31 is: 118.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.31 : 314.02 = 79.31 : x
  2. Step 2: Convert to fraction form
    209.31/314.02 = 79.31/x
  3. Step 3: Cross multiply
    209.31x = 314.02 × 79.31
  4. Step 4: Simplify right side
    209.31x = 24,903.74
  5. Step 5: Solve for x
    x = 24,903.74/209.31
  6. Step 6: Final answer
    x = 118.98

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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.