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Finding the Fourth Proportional to 646.05, 961.47 and 639.57

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Solution

The fourth proportional to 646.05, 961.47 and 639.57 is: 951.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.05 : 961.47 = 639.57 : x
  2. Step 2: Convert to fraction form
    646.05/961.47 = 639.57/x
  3. Step 3: Cross multiply
    646.05x = 961.47 × 639.57
  4. Step 4: Simplify right side
    646.05x = 614,927.37
  5. Step 5: Solve for x
    x = 614,927.37/646.05
  6. Step 6: Final answer
    x = 951.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.