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Finding the Fourth Proportional to 458.22, 687.40 and 318.10

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Solution

The fourth proportional to 458.22, 687.40 and 318.10 is: 477.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.22 : 687.40 = 318.10 : x
  2. Step 2: Convert to fraction form
    458.22/687.40 = 318.10/x
  3. Step 3: Cross multiply
    458.22x = 687.40 × 318.10
  4. Step 4: Simplify right side
    458.22x = 218,661.94
  5. Step 5: Solve for x
    x = 218,661.94/458.22
  6. Step 6: Final answer
    x = 477.20

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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.