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Finding the Fourth Proportional to 409.39, 565.32 and 278.71

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Solution

The fourth proportional to 409.39, 565.32 and 278.71 is: 384.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.39 : 565.32 = 278.71 : x
  2. Step 2: Convert to fraction form
    409.39/565.32 = 278.71/x
  3. Step 3: Cross multiply
    409.39x = 565.32 × 278.71
  4. Step 4: Simplify right side
    409.39x = 157,560.34
  5. Step 5: Solve for x
    x = 157,560.34/409.39
  6. Step 6: Final answer
    x = 384.87

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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.