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Finding the Fourth Proportional to 287.69, 398.69 and 282.22

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Solution

The fourth proportional to 287.69, 398.69 and 282.22 is: 391.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.69 : 398.69 = 282.22 : x
  2. Step 2: Convert to fraction form
    287.69/398.69 = 282.22/x
  3. Step 3: Cross multiply
    287.69x = 398.69 × 282.22
  4. Step 4: Simplify right side
    287.69x = 112,518.29
  5. Step 5: Solve for x
    x = 112,518.29/287.69
  6. Step 6: Final answer
    x = 391.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.