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Finding the Fourth Proportional to 465.57, 642.40 and 318.15

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Solution

The fourth proportional to 465.57, 642.40 and 318.15 is: 438.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.57 : 642.40 = 318.15 : x
  2. Step 2: Convert to fraction form
    465.57/642.40 = 318.15/x
  3. Step 3: Cross multiply
    465.57x = 642.40 × 318.15
  4. Step 4: Simplify right side
    465.57x = 204,378.76
  5. Step 5: Solve for x
    x = 204,378.76/465.57
  6. Step 6: Final answer
    x = 438.99

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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.