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Finding the Fourth Proportional to 669.85, 925.55 and 553.21

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Solution

The fourth proportional to 669.85, 925.55 and 553.21 is: 764.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.85 : 925.55 = 553.21 : x
  2. Step 2: Convert to fraction form
    669.85/925.55 = 553.21/x
  3. Step 3: Cross multiply
    669.85x = 925.55 × 553.21
  4. Step 4: Simplify right side
    669.85x = 512,023.52
  5. Step 5: Solve for x
    x = 512,023.52/669.85
  6. Step 6: Final answer
    x = 764.39

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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.