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Finding the Fourth Proportional to 409.61, 565.19 and 243.87

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Solution

The fourth proportional to 409.61, 565.19 and 243.87 is: 336.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.61 : 565.19 = 243.87 : x
  2. Step 2: Convert to fraction form
    409.61/565.19 = 243.87/x
  3. Step 3: Cross multiply
    409.61x = 565.19 × 243.87
  4. Step 4: Simplify right side
    409.61x = 137,830.86
  5. Step 5: Solve for x
    x = 137,830.86/409.61
  6. Step 6: Final answer
    x = 336.49

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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.