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Finding the Fourth Proportional to 458.63, 687.46 and 215.31

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Solution

The fourth proportional to 458.63, 687.46 and 215.31 is: 322.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.63 : 687.46 = 215.31 : x
  2. Step 2: Convert to fraction form
    458.63/687.46 = 215.31/x
  3. Step 3: Cross multiply
    458.63x = 687.46 × 215.31
  4. Step 4: Simplify right side
    458.63x = 148,017.01
  5. Step 5: Solve for x
    x = 148,017.01/458.63
  6. Step 6: Final answer
    x = 322.74

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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.