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Finding the Fourth Proportional to 646.70, 967.95 and 427.49

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Solution

The fourth proportional to 646.70, 967.95 and 427.49 is: 639.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.70 : 967.95 = 427.49 : x
  2. Step 2: Convert to fraction form
    646.70/967.95 = 427.49/x
  3. Step 3: Cross multiply
    646.70x = 967.95 × 427.49
  4. Step 4: Simplify right side
    646.70x = 413,793.18
  5. Step 5: Solve for x
    x = 413,793.18/646.70
  6. Step 6: Final answer
    x = 639.85

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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.