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Finding the Fourth Proportional to 354.17, 487.22 and 309.72

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Solution

The fourth proportional to 354.17, 487.22 and 309.72 is: 426.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.17 : 487.22 = 309.72 : x
  2. Step 2: Convert to fraction form
    354.17/487.22 = 309.72/x
  3. Step 3: Cross multiply
    354.17x = 487.22 × 309.72
  4. Step 4: Simplify right side
    354.17x = 150,902.06
  5. Step 5: Solve for x
    x = 150,902.06/354.17
  6. Step 6: Final answer
    x = 426.07

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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.