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Finding the Fourth Proportional to 458.43, 687.88 and 215.13

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Solution

The fourth proportional to 458.43, 687.88 and 215.13 is: 322.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.43 : 687.88 = 215.13 : x
  2. Step 2: Convert to fraction form
    458.43/687.88 = 215.13/x
  3. Step 3: Cross multiply
    458.43x = 687.88 × 215.13
  4. Step 4: Simplify right side
    458.43x = 147,983.62
  5. Step 5: Solve for x
    x = 147,983.62/458.43
  6. Step 6: Final answer
    x = 322.81

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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.