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Finding the Fourth Proportional to 642.77, 963.74 and 354.41

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Solution

The fourth proportional to 642.77, 963.74 and 354.41 is: 531.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.77 : 963.74 = 354.41 : x
  2. Step 2: Convert to fraction form
    642.77/963.74 = 354.41/x
  3. Step 3: Cross multiply
    642.77x = 963.74 × 354.41
  4. Step 4: Simplify right side
    642.77x = 341,555.16
  5. Step 5: Solve for x
    x = 341,555.16/642.77
  6. Step 6: Final answer
    x = 531.38

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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.