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Finding the Fourth Proportional to 939.72, 1,296.23 and 590.61

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Solution

The fourth proportional to 939.72, 1,296.23 and 590.61 is: 814.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.72 : 1,296.23 = 590.61 : x
  2. Step 2: Convert to fraction form
    939.72/1,296.23 = 590.61/x
  3. Step 3: Cross multiply
    939.72x = 1,296.23 × 590.61
  4. Step 4: Simplify right side
    939.72x = 765,563.45
  5. Step 5: Solve for x
    x = 765,563.45/939.72
  6. Step 6: Final answer
    x = 814.67

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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.