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Finding the Fourth Proportional to 949.11, 1,309.78 and 556.15

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Solution

The fourth proportional to 949.11, 1,309.78 and 556.15 is: 767.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.11 : 1,309.78 = 556.15 : x
  2. Step 2: Convert to fraction form
    949.11/1,309.78 = 556.15/x
  3. Step 3: Cross multiply
    949.11x = 1,309.78 × 556.15
  4. Step 4: Simplify right side
    949.11x = 728,427.60
  5. Step 5: Solve for x
    x = 728,427.60/949.11
  6. Step 6: Final answer
    x = 767.48

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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.