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Finding the Fourth Proportional to 1,171.23, 1,617.66 and 777.57

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Solution

The fourth proportional to 1,171.23, 1,617.66 and 777.57 is: 1,073.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.23 : 1,617.66 = 777.57 : x
  2. Step 2: Convert to fraction form
    1,171.23/1,617.66 = 777.57/x
  3. Step 3: Cross multiply
    1,171.23x = 1,617.66 × 777.57
  4. Step 4: Simplify right side
    1,171.23x = 1,257,843.89
  5. Step 5: Solve for x
    x = 1,257,843.89/1,171.23
  6. Step 6: Final answer
    x = 1,073.95

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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.