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Finding the Fourth Proportional to 939.60, 1,296.64 and 519.96

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Solution

The fourth proportional to 939.60, 1,296.64 and 519.96 is: 717.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.60 : 1,296.64 = 519.96 : x
  2. Step 2: Convert to fraction form
    939.60/1,296.64 = 519.96/x
  3. Step 3: Cross multiply
    939.60x = 1,296.64 × 519.96
  4. Step 4: Simplify right side
    939.60x = 674,200.93
  5. Step 5: Solve for x
    x = 674,200.93/939.60
  6. Step 6: Final answer
    x = 717.54

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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.