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Finding the Fourth Proportional to 351.15, 485.71 and 287.16

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Solution

The fourth proportional to 351.15, 485.71 and 287.16 is: 397.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.15 : 485.71 = 287.16 : x
  2. Step 2: Convert to fraction form
    351.15/485.71 = 287.16/x
  3. Step 3: Cross multiply
    351.15x = 485.71 × 287.16
  4. Step 4: Simplify right side
    351.15x = 139,476.48
  5. Step 5: Solve for x
    x = 139,476.48/351.15
  6. Step 6: Final answer
    x = 397.20

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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.