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Finding the Fourth Proportional to 409.64, 565.31 and 243.86

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Solution

The fourth proportional to 409.64, 565.31 and 243.86 is: 336.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.64 : 565.31 = 243.86 : x
  2. Step 2: Convert to fraction form
    409.64/565.31 = 243.86/x
  3. Step 3: Cross multiply
    409.64x = 565.31 × 243.86
  4. Step 4: Simplify right side
    409.64x = 137,852.45
  5. Step 5: Solve for x
    x = 137,852.45/409.64
  6. Step 6: Final answer
    x = 336.53

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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.