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Finding the Fourth Proportional to 458.00, 631.68 and 318.11

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Solution

The fourth proportional to 458.00, 631.68 and 318.11 is: 438.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.00 : 631.68 = 318.11 : x
  2. Step 2: Convert to fraction form
    458.00/631.68 = 318.11/x
  3. Step 3: Cross multiply
    458.00x = 631.68 × 318.11
  4. Step 4: Simplify right side
    458.00x = 200,943.72
  5. Step 5: Solve for x
    x = 200,943.72/458.00
  6. Step 6: Final answer
    x = 438.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.