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Finding the Fourth Proportional to 642.10, 963.34 and 317.70

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Solution

The fourth proportional to 642.10, 963.34 and 317.70 is: 476.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.10 : 963.34 = 317.70 : x
  2. Step 2: Convert to fraction form
    642.10/963.34 = 317.70/x
  3. Step 3: Cross multiply
    642.10x = 963.34 × 317.70
  4. Step 4: Simplify right side
    642.10x = 306,053.12
  5. Step 5: Solve for x
    x = 306,053.12/642.10
  6. Step 6: Final answer
    x = 476.64

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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.