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Finding the Fourth Proportional to 459.36, 634.08 and 312.75

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Solution

The fourth proportional to 459.36, 634.08 and 312.75 is: 431.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.36 : 634.08 = 312.75 : x
  2. Step 2: Convert to fraction form
    459.36/634.08 = 312.75/x
  3. Step 3: Cross multiply
    459.36x = 634.08 × 312.75
  4. Step 4: Simplify right side
    459.36x = 198,308.52
  5. Step 5: Solve for x
    x = 198,308.52/459.36
  6. Step 6: Final answer
    x = 431.71

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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.