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Finding the Fourth Proportional to 287.11, 396.21 and 156.11

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Solution

The fourth proportional to 287.11, 396.21 and 156.11 is: 215.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.11 : 396.21 = 156.11 : x
  2. Step 2: Convert to fraction form
    287.11/396.21 = 156.11/x
  3. Step 3: Cross multiply
    287.11x = 396.21 × 156.11
  4. Step 4: Simplify right side
    287.11x = 61,852.34
  5. Step 5: Solve for x
    x = 61,852.34/287.11
  6. Step 6: Final answer
    x = 215.43

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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.