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Finding the Fourth Proportional to 642.36, 963.18 and 317.28

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Solution

The fourth proportional to 642.36, 963.18 and 317.28 is: 475.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.36 : 963.18 = 317.28 : x
  2. Step 2: Convert to fraction form
    642.36/963.18 = 317.28/x
  3. Step 3: Cross multiply
    642.36x = 963.18 × 317.28
  4. Step 4: Simplify right side
    642.36x = 305,597.75
  5. Step 5: Solve for x
    x = 305,597.75/642.36
  6. Step 6: Final answer
    x = 475.74

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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.