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Finding the Fourth Proportional to 459.25, 634.28 and 311.63

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Solution

The fourth proportional to 459.25, 634.28 and 311.63 is: 430.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.25 : 634.28 = 311.63 : x
  2. Step 2: Convert to fraction form
    459.25/634.28 = 311.63/x
  3. Step 3: Cross multiply
    459.25x = 634.28 × 311.63
  4. Step 4: Simplify right side
    459.25x = 197,655.95
  5. Step 5: Solve for x
    x = 197,655.95/459.25
  6. Step 6: Final answer
    x = 430.39

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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.