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Finding the Fourth Proportional to 669.28, 923.78 and 448.46

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Solution

The fourth proportional to 669.28, 923.78 and 448.46 is: 618.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.28 : 923.78 = 448.46 : x
  2. Step 2: Convert to fraction form
    669.28/923.78 = 448.46/x
  3. Step 3: Cross multiply
    669.28x = 923.78 × 448.46
  4. Step 4: Simplify right side
    669.28x = 414,278.38
  5. Step 5: Solve for x
    x = 414,278.38/669.28
  6. Step 6: Final answer
    x = 618.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.