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Finding the Fourth Proportional to 287.94, 397.19 and 209.17

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Solution

The fourth proportional to 287.94, 397.19 and 209.17 is: 288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.94 : 397.19 = 209.17 : x
  2. Step 2: Convert to fraction form
    287.94/397.19 = 209.17/x
  3. Step 3: Cross multiply
    287.94x = 397.19 × 209.17
  4. Step 4: Simplify right side
    287.94x = 83,079.76
  5. Step 5: Solve for x
    x = 83,079.76/287.94
  6. Step 6: Final answer
    x = 288.53

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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.