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Finding the Fourth Proportional to 465.64, 642.26 and 318.02

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Solution

The fourth proportional to 465.64, 642.26 and 318.02 is: 438.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.64 : 642.26 = 318.02 : x
  2. Step 2: Convert to fraction form
    465.64/642.26 = 318.02/x
  3. Step 3: Cross multiply
    465.64x = 642.26 × 318.02
  4. Step 4: Simplify right side
    465.64x = 204,251.53
  5. Step 5: Solve for x
    x = 204,251.53/465.64
  6. Step 6: Final answer
    x = 438.65

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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.