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Finding the Fourth Proportional to 458.43, 687.87 and 211.65

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Solution

The fourth proportional to 458.43, 687.87 and 211.65 is: 317.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.43 : 687.87 = 211.65 : x
  2. Step 2: Convert to fraction form
    458.43/687.87 = 211.65/x
  3. Step 3: Cross multiply
    458.43x = 687.87 × 211.65
  4. Step 4: Simplify right side
    458.43x = 145,587.69
  5. Step 5: Solve for x
    x = 145,587.69/458.43
  6. Step 6: Final answer
    x = 317.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.