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Finding the Fourth Proportional to 649.73, 968.57 and 639.74

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Solution

The fourth proportional to 649.73, 968.57 and 639.74 is: 953.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.73 : 968.57 = 639.74 : x
  2. Step 2: Convert to fraction form
    649.73/968.57 = 639.74/x
  3. Step 3: Cross multiply
    649.73x = 968.57 × 639.74
  4. Step 4: Simplify right side
    649.73x = 619,628.13
  5. Step 5: Solve for x
    x = 619,628.13/649.73
  6. Step 6: Final answer
    x = 953.68

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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.