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Finding the Fourth Proportional to 458.32, 687 and 211.24

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Solution

The fourth proportional to 458.32, 687 and 211.24 is: 316.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.32 : 687 = 211.24 : x
  2. Step 2: Convert to fraction form
    458.32/687 = 211.24/x
  3. Step 3: Cross multiply
    458.32x = 687 × 211.24
  4. Step 4: Simplify right side
    458.32x = 145,121.88
  5. Step 5: Solve for x
    x = 145,121.88/458.32
  6. Step 6: Final answer
    x = 316.64

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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.