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Finding the Fourth Proportional to 310.12, 427.56 and 286.66

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Solution

The fourth proportional to 310.12, 427.56 and 286.66 is: 395.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.12 : 427.56 = 286.66 : x
  2. Step 2: Convert to fraction form
    310.12/427.56 = 286.66/x
  3. Step 3: Cross multiply
    310.12x = 427.56 × 286.66
  4. Step 4: Simplify right side
    310.12x = 122,564.35
  5. Step 5: Solve for x
    x = 122,564.35/310.12
  6. Step 6: Final answer
    x = 395.22

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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.