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Finding the Fourth Proportional to 642.91, 964.47 and 277.70

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Solution

The fourth proportional to 642.91, 964.47 and 277.70 is: 416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.91 : 964.47 = 277.70 : x
  2. Step 2: Convert to fraction form
    642.91/964.47 = 277.70/x
  3. Step 3: Cross multiply
    642.91x = 964.47 × 277.70
  4. Step 4: Simplify right side
    642.91x = 267,833.32
  5. Step 5: Solve for x
    x = 267,833.32/642.91
  6. Step 6: Final answer
    x = 416.60

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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.