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Finding the Fourth Proportional to 439.38, 657.99 and 317.07

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Solution

The fourth proportional to 439.38, 657.99 and 317.07 is: 474.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.38 : 657.99 = 317.07 : x
  2. Step 2: Convert to fraction form
    439.38/657.99 = 317.07/x
  3. Step 3: Cross multiply
    439.38x = 657.99 × 317.07
  4. Step 4: Simplify right side
    439.38x = 208,628.89
  5. Step 5: Solve for x
    x = 208,628.89/439.38
  6. Step 6: Final answer
    x = 474.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.