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Finding the Fourth Proportional to 642.36, 963.60 and 317.64

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Solution

The fourth proportional to 642.36, 963.60 and 317.64 is: 476.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.36 : 963.60 = 317.64 : x
  2. Step 2: Convert to fraction form
    642.36/963.60 = 317.64/x
  3. Step 3: Cross multiply
    642.36x = 963.60 × 317.64
  4. Step 4: Simplify right side
    642.36x = 306,077.90
  5. Step 5: Solve for x
    x = 306,077.90/642.36
  6. Step 6: Final answer
    x = 476.49

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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.