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Finding the Fourth Proportional to 287, 396.06 and 156.01

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Solution

The fourth proportional to 287, 396.06 and 156.01 is: 215.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    287 : 396.06 = 156.01 : x
  2. Step 2: Convert to fraction form
    287/396.06 = 156.01/x
  3. Step 3: Cross multiply
    287x = 396.06 × 156.01
  4. Step 4: Simplify right side
    287x = 61,789.32
  5. Step 5: Solve for x
    x = 61,789.32/287
  6. Step 6: Final answer
    x = 215.29

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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.