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Finding the Fourth Proportional to 669.11, 921.69 and 558.54

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Solution

The fourth proportional to 669.11, 921.69 and 558.54 is: 769.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.11 : 921.69 = 558.54 : x
  2. Step 2: Convert to fraction form
    669.11/921.69 = 558.54/x
  3. Step 3: Cross multiply
    669.11x = 921.69 × 558.54
  4. Step 4: Simplify right side
    669.11x = 514,800.73
  5. Step 5: Solve for x
    x = 514,800.73/669.11
  6. Step 6: Final answer
    x = 769.39

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Half scale
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Double scale
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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.