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Finding the Fourth Proportional to 669.44, 998.70 and 638.48

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Solution

The fourth proportional to 669.44, 998.70 and 638.48 is: 952.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.44 : 998.70 = 638.48 : x
  2. Step 2: Convert to fraction form
    669.44/998.70 = 638.48/x
  3. Step 3: Cross multiply
    669.44x = 998.70 × 638.48
  4. Step 4: Simplify right side
    669.44x = 637,649.98
  5. Step 5: Solve for x
    x = 637,649.98/669.44
  6. Step 6: Final answer
    x = 952.51

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Double scale
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1.5x scale

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.