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Finding the Fourth Proportional to 458.10, 632.61 and 318.65

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Solution

The fourth proportional to 458.10, 632.61 and 318.65 is: 440.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.10 : 632.61 = 318.65 : x
  2. Step 2: Convert to fraction form
    458.10/632.61 = 318.65/x
  3. Step 3: Cross multiply
    458.10x = 632.61 × 318.65
  4. Step 4: Simplify right side
    458.10x = 201,578.01
  5. Step 5: Solve for x
    x = 201,578.01/458.10
  6. Step 6: Final answer
    x = 440.03

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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.