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Finding the Fourth Proportional to 458.87, 687.99 and 215.16

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Solution

The fourth proportional to 458.87, 687.99 and 215.16 is: 322.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.87 : 687.99 = 215.16 : x
  2. Step 2: Convert to fraction form
    458.87/687.99 = 215.16/x
  3. Step 3: Cross multiply
    458.87x = 687.99 × 215.16
  4. Step 4: Simplify right side
    458.87x = 148,026.16
  5. Step 5: Solve for x
    x = 148,026.16/458.87
  6. Step 6: Final answer
    x = 322.59

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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.