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Finding the Fourth Proportional to 1,393.22, 2,087.71 and 777.13

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Solution

The fourth proportional to 1,393.22, 2,087.71 and 777.13 is: 1,164.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.22 : 2,087.71 = 777.13 : x
  2. Step 2: Convert to fraction form
    1,393.22/2,087.71 = 777.13/x
  3. Step 3: Cross multiply
    1,393.22x = 2,087.71 × 777.13
  4. Step 4: Simplify right side
    1,393.22x = 1,622,414.91
  5. Step 5: Solve for x
    x = 1,622,414.91/1,393.22
  6. Step 6: Final answer
    x = 1,164.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.