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Finding the Fourth Proportional to 287.17, 396.28 and 156.18

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Solution

The fourth proportional to 287.17, 396.28 and 156.18 is: 215.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.17 : 396.28 = 156.18 : x
  2. Step 2: Convert to fraction form
    287.17/396.28 = 156.18/x
  3. Step 3: Cross multiply
    287.17x = 396.28 × 156.18
  4. Step 4: Simplify right side
    287.17x = 61,890.90
  5. Step 5: Solve for x
    x = 61,890.90/287.17
  6. Step 6: Final answer
    x = 215.52

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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.