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Finding the Fourth Proportional to 465.86, 642.90 and 318.56

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Solution

The fourth proportional to 465.86, 642.90 and 318.56 is: 439.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.86 : 642.90 = 318.56 : x
  2. Step 2: Convert to fraction form
    465.86/642.90 = 318.56/x
  3. Step 3: Cross multiply
    465.86x = 642.90 × 318.56
  4. Step 4: Simplify right side
    465.86x = 204,802.22
  5. Step 5: Solve for x
    x = 204,802.22/465.86
  6. Step 6: Final answer
    x = 439.62

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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.