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Finding the Fourth Proportional to 409.41, 565.37 and 278.79

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Solution

The fourth proportional to 409.41, 565.37 and 278.79 is: 384.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.41 : 565.37 = 278.79 : x
  2. Step 2: Convert to fraction form
    409.41/565.37 = 278.79/x
  3. Step 3: Cross multiply
    409.41x = 565.37 × 278.79
  4. Step 4: Simplify right side
    409.41x = 157,618.11
  5. Step 5: Solve for x
    x = 157,618.11/409.41
  6. Step 6: Final answer
    x = 384.99

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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.