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Finding the Fourth Proportional to 209.76, 314.71 and 127.51

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Solution

The fourth proportional to 209.76, 314.71 and 127.51 is: 191.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.76 : 314.71 = 127.51 : x
  2. Step 2: Convert to fraction form
    209.76/314.71 = 127.51/x
  3. Step 3: Cross multiply
    209.76x = 314.71 × 127.51
  4. Step 4: Simplify right side
    209.76x = 40,128.75
  5. Step 5: Solve for x
    x = 40,128.75/209.76
  6. Step 6: Final answer
    x = 191.31

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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.