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Finding the Fourth Proportional to 939.16, 1,406.96 and 528.59

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Solution

The fourth proportional to 939.16, 1,406.96 and 528.59 is: 791.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.16 : 1,406.96 = 528.59 : x
  2. Step 2: Convert to fraction form
    939.16/1,406.96 = 528.59/x
  3. Step 3: Cross multiply
    939.16x = 1,406.96 × 528.59
  4. Step 4: Simplify right side
    939.16x = 743,704.99
  5. Step 5: Solve for x
    x = 743,704.99/939.16
  6. Step 6: Final answer
    x = 791.88

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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.