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Finding the Fourth Proportional to 459.75, 634.97 and 312.13

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Solution

The fourth proportional to 459.75, 634.97 and 312.13 is: 431.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.75 : 634.97 = 312.13 : x
  2. Step 2: Convert to fraction form
    459.75/634.97 = 312.13/x
  3. Step 3: Cross multiply
    459.75x = 634.97 × 312.13
  4. Step 4: Simplify right side
    459.75x = 198,188.45
  5. Step 5: Solve for x
    x = 198,188.45/459.75
  6. Step 6: Final answer
    x = 431.08

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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.