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Finding the Fourth Proportional to 642.83, 964.34 and 277.61

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Solution

The fourth proportional to 642.83, 964.34 and 277.61 is: 416.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.83 : 964.34 = 277.61 : x
  2. Step 2: Convert to fraction form
    642.83/964.34 = 277.61/x
  3. Step 3: Cross multiply
    642.83x = 964.34 × 277.61
  4. Step 4: Simplify right side
    642.83x = 267,710.43
  5. Step 5: Solve for x
    x = 267,710.43/642.83
  6. Step 6: Final answer
    x = 416.46

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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.