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Finding the Fourth Proportional to 939.58, 1,296.52 and 561.47

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Solution

The fourth proportional to 939.58, 1,296.52 and 561.47 is: 774.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.58 : 1,296.52 = 561.47 : x
  2. Step 2: Convert to fraction form
    939.58/1,296.52 = 561.47/x
  3. Step 3: Cross multiply
    939.58x = 1,296.52 × 561.47
  4. Step 4: Simplify right side
    939.58x = 727,949.20
  5. Step 5: Solve for x
    x = 727,949.20/939.58
  6. Step 6: Final answer
    x = 774.76

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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.