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Finding the Fourth Proportional to 458.84, 687.88 and 215.48

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Solution

The fourth proportional to 458.84, 687.88 and 215.48 is: 323.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.84 : 687.88 = 215.48 : x
  2. Step 2: Convert to fraction form
    458.84/687.88 = 215.48/x
  3. Step 3: Cross multiply
    458.84x = 687.88 × 215.48
  4. Step 4: Simplify right side
    458.84x = 148,224.38
  5. Step 5: Solve for x
    x = 148,224.38/458.84
  6. Step 6: Final answer
    x = 323.04

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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.