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Finding the Fourth Proportional to 458.35, 687.86 and 215.04

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Solution

The fourth proportional to 458.35, 687.86 and 215.04 is: 322.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.35 : 687.86 = 215.04 : x
  2. Step 2: Convert to fraction form
    458.35/687.86 = 215.04/x
  3. Step 3: Cross multiply
    458.35x = 687.86 × 215.04
  4. Step 4: Simplify right side
    458.35x = 147,919.73
  5. Step 5: Solve for x
    x = 147,919.73/458.35
  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.