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Finding the Fourth Proportional to 287.12, 396.16 and 169.07

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Solution

The fourth proportional to 287.12, 396.16 and 169.07 is: 233.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.12 : 396.16 = 169.07 : x
  2. Step 2: Convert to fraction form
    287.12/396.16 = 169.07/x
  3. Step 3: Cross multiply
    287.12x = 396.16 × 169.07
  4. Step 4: Simplify right side
    287.12x = 66,978.77
  5. Step 5: Solve for x
    x = 66,978.77/287.12
  6. Step 6: Final answer
    x = 233.28

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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.