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Finding the Fourth Proportional to 409.65, 565.03 and 285.35

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Solution

The fourth proportional to 409.65, 565.03 and 285.35 is: 393.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.65 : 565.03 = 285.35 : x
  2. Step 2: Convert to fraction form
    409.65/565.03 = 285.35/x
  3. Step 3: Cross multiply
    409.65x = 565.03 × 285.35
  4. Step 4: Simplify right side
    409.65x = 161,231.31
  5. Step 5: Solve for x
    x = 161,231.31/409.65
  6. Step 6: Final answer
    x = 393.58

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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.