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Finding the Fourth Proportional to 287.32, 395.90 and 195.16

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Solution

The fourth proportional to 287.32, 395.90 and 195.16 is: 268.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.32 : 395.90 = 195.16 : x
  2. Step 2: Convert to fraction form
    287.32/395.90 = 195.16/x
  3. Step 3: Cross multiply
    287.32x = 395.90 × 195.16
  4. Step 4: Simplify right side
    287.32x = 77,263.84
  5. Step 5: Solve for x
    x = 77,263.84/287.32
  6. Step 6: Final answer
    x = 268.91

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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.