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Finding the Fourth Proportional to 1,115.99, 1,539.22 and 939.89

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Solution

The fourth proportional to 1,115.99, 1,539.22 and 939.89 is: 1,296.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.99 : 1,539.22 = 939.89 : x
  2. Step 2: Convert to fraction form
    1,115.99/1,539.22 = 939.89/x
  3. Step 3: Cross multiply
    1,115.99x = 1,539.22 × 939.89
  4. Step 4: Simplify right side
    1,115.99x = 1,446,697.49
  5. Step 5: Solve for x
    x = 1,446,697.49/1,115.99
  6. Step 6: Final answer
    x = 1,296.34

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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.