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Finding the Third Proportional to 256.29 and 307.55

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Solution

The third proportional to 256.29 and 307.55 is: 369.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.29 : 307.55 = 307.55 : x
  2. Step 2: Convert to fraction form
    256.29/307.55 = 307.55/x
  3. Step 3: Cross multiply
    256.29x = 307.55 × 307.55
  4. Step 4: Simplify right side
    256.29x = 94,585.08
  5. Step 5: Solve for x
    x = 94,585.08/256.29
  6. Step 6: Final answer
    x = 369.06

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.