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Finding the Fourth Proportional to 458.86, 687.97 and 215.25

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Solution

The fourth proportional to 458.86, 687.97 and 215.25 is: 322.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.86 : 687.97 = 215.25 : x
  2. Step 2: Convert to fraction form
    458.86/687.97 = 215.25/x
  3. Step 3: Cross multiply
    458.86x = 687.97 × 215.25
  4. Step 4: Simplify right side
    458.86x = 148,085.54
  5. Step 5: Solve for x
    x = 148,085.54/458.86
  6. Step 6: Final answer
    x = 322.72

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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.