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Finding the Fourth Proportional to 287.21, 396.35 and 156.22

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Solution

The fourth proportional to 287.21, 396.35 and 156.22 is: 215.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.21 : 396.35 = 156.22 : x
  2. Step 2: Convert to fraction form
    287.21/396.35 = 156.22/x
  3. Step 3: Cross multiply
    287.21x = 396.35 × 156.22
  4. Step 4: Simplify right side
    287.21x = 61,917.20
  5. Step 5: Solve for x
    x = 61,917.20/287.21
  6. Step 6: Final answer
    x = 215.59

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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.