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Finding the Fourth Proportional to 310.72, 426.32 and 302.56

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Solution

The fourth proportional to 310.72, 426.32 and 302.56 is: 415.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.72 : 426.32 = 302.56 : x
  2. Step 2: Convert to fraction form
    310.72/426.32 = 302.56/x
  3. Step 3: Cross multiply
    310.72x = 426.32 × 302.56
  4. Step 4: Simplify right side
    310.72x = 128,987.38
  5. Step 5: Solve for x
    x = 128,987.38/310.72
  6. Step 6: Final answer
    x = 415.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.