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Finding the Fourth Proportional to 459.99, 634.89 and 312.54

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Solution

The fourth proportional to 459.99, 634.89 and 312.54 is: 431.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.99 : 634.89 = 312.54 : x
  2. Step 2: Convert to fraction form
    459.99/634.89 = 312.54/x
  3. Step 3: Cross multiply
    459.99x = 634.89 × 312.54
  4. Step 4: Simplify right side
    459.99x = 198,428.52
  5. Step 5: Solve for x
    x = 198,428.52/459.99
  6. Step 6: Final answer
    x = 431.38

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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.