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Finding the Fourth Proportional to 458.72, 687.74 and 215.42

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Solution

The fourth proportional to 458.72, 687.74 and 215.42 is: 322.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.72 : 687.74 = 215.42 : x
  2. Step 2: Convert to fraction form
    458.72/687.74 = 215.42/x
  3. Step 3: Cross multiply
    458.72x = 687.74 × 215.42
  4. Step 4: Simplify right side
    458.72x = 148,148.44
  5. Step 5: Solve for x
    x = 148,148.44/458.72
  6. Step 6: Final answer
    x = 322.96

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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.