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Finding the Fourth Proportional to 458.90, 632.48 and 311.48

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Solution

The fourth proportional to 458.90, 632.48 and 311.48 is: 429.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.90 : 632.48 = 311.48 : x
  2. Step 2: Convert to fraction form
    458.90/632.48 = 311.48/x
  3. Step 3: Cross multiply
    458.90x = 632.48 × 311.48
  4. Step 4: Simplify right side
    458.90x = 197,004.87
  5. Step 5: Solve for x
    x = 197,004.87/458.90
  6. Step 6: Final answer
    x = 429.30

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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.