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Finding the Fourth Proportional to 920.73, 1,379.60 and 451.67

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Solution

The fourth proportional to 920.73, 1,379.60 and 451.67 is: 676.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.73 : 1,379.60 = 451.67 : x
  2. Step 2: Convert to fraction form
    920.73/1,379.60 = 451.67/x
  3. Step 3: Cross multiply
    920.73x = 1,379.60 × 451.67
  4. Step 4: Simplify right side
    920.73x = 623,114.78
  5. Step 5: Solve for x
    x = 623,114.78/920.73
  6. Step 6: Final answer
    x = 676.76

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.