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Finding the Fourth Proportional to 458.43, 632.69 and 318.51

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Solution

The fourth proportional to 458.43, 632.69 and 318.51 is: 439.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.43 : 632.69 = 318.51 : x
  2. Step 2: Convert to fraction form
    458.43/632.69 = 318.51/x
  3. Step 3: Cross multiply
    458.43x = 632.69 × 318.51
  4. Step 4: Simplify right side
    458.43x = 201,516.50
  5. Step 5: Solve for x
    x = 201,516.50/458.43
  6. Step 6: Final answer
    x = 439.58

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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.