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Finding the Fourth Proportional to 309.64, 426.16 and 272.56

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Solution

The fourth proportional to 309.64, 426.16 and 272.56 is: 375.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.64 : 426.16 = 272.56 : x
  2. Step 2: Convert to fraction form
    309.64/426.16 = 272.56/x
  3. Step 3: Cross multiply
    309.64x = 426.16 × 272.56
  4. Step 4: Simplify right side
    309.64x = 116,154.17
  5. Step 5: Solve for x
    x = 116,154.17/309.64
  6. Step 6: Final answer
    x = 375.13

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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.