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Finding the Fourth Proportional to 920.30, 1,379.73 and 630.86

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Solution

The fourth proportional to 920.30, 1,379.73 and 630.86 is: 945.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.30 : 1,379.73 = 630.86 : x
  2. Step 2: Convert to fraction form
    920.30/1,379.73 = 630.86/x
  3. Step 3: Cross multiply
    920.30x = 1,379.73 × 630.86
  4. Step 4: Simplify right side
    920.30x = 870,416.47
  5. Step 5: Solve for x
    x = 870,416.47/920.30
  6. Step 6: Final answer
    x = 945.80

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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.