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Finding the Fourth Proportional to 1,151.77, 1,590.38 and 939.12

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Solution

The fourth proportional to 1,151.77, 1,590.38 and 939.12 is: 1,296.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.77 : 1,590.38 = 939.12 : x
  2. Step 2: Convert to fraction form
    1,151.77/1,590.38 = 939.12/x
  3. Step 3: Cross multiply
    1,151.77x = 1,590.38 × 939.12
  4. Step 4: Simplify right side
    1,151.77x = 1,493,557.67
  5. Step 5: Solve for x
    x = 1,493,557.67/1,151.77
  6. Step 6: Final answer
    x = 1,296.75

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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.