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Finding the Fourth Proportional to 670.28, 998.17 and 628.76

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Solution

The fourth proportional to 670.28, 998.17 and 628.76 is: 936.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.28 : 998.17 = 628.76 : x
  2. Step 2: Convert to fraction form
    670.28/998.17 = 628.76/x
  3. Step 3: Cross multiply
    670.28x = 998.17 × 628.76
  4. Step 4: Simplify right side
    670.28x = 627,609.37
  5. Step 5: Solve for x
    x = 627,609.37/670.28
  6. Step 6: Final answer
    x = 936.34

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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.