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Finding the Fourth Proportional to 407.35, 561.92 and 308.94

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Solution

The fourth proportional to 407.35, 561.92 and 308.94 is: 426.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.35 : 561.92 = 308.94 : x
  2. Step 2: Convert to fraction form
    407.35/561.92 = 308.94/x
  3. Step 3: Cross multiply
    407.35x = 561.92 × 308.94
  4. Step 4: Simplify right side
    407.35x = 173,599.56
  5. Step 5: Solve for x
    x = 173,599.56/407.35
  6. Step 6: Final answer
    x = 426.17

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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.