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Finding the Fourth Proportional to 287.07, 395.67 and 221.46

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Solution

The fourth proportional to 287.07, 395.67 and 221.46 is: 305.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.07 : 395.67 = 221.46 : x
  2. Step 2: Convert to fraction form
    287.07/395.67 = 221.46/x
  3. Step 3: Cross multiply
    287.07x = 395.67 × 221.46
  4. Step 4: Simplify right side
    287.07x = 87,625.08
  5. Step 5: Solve for x
    x = 87,625.08/287.07
  6. Step 6: Final answer
    x = 305.24

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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.