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Finding the Fourth Proportional to 310.47, 428.67 and 223.17

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Solution

The fourth proportional to 310.47, 428.67 and 223.17 is: 308.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.47 : 428.67 = 223.17 : x
  2. Step 2: Convert to fraction form
    310.47/428.67 = 223.17/x
  3. Step 3: Cross multiply
    310.47x = 428.67 × 223.17
  4. Step 4: Simplify right side
    310.47x = 95,666.28
  5. Step 5: Solve for x
    x = 95,666.28/310.47
  6. Step 6: Final answer
    x = 308.13

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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.