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Finding the Fourth Proportional to 1,374.71, 1,896.97 and 777.28

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Solution

The fourth proportional to 1,374.71, 1,896.97 and 777.28 is: 1,072.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.71 : 1,896.97 = 777.28 : x
  2. Step 2: Convert to fraction form
    1,374.71/1,896.97 = 777.28/x
  3. Step 3: Cross multiply
    1,374.71x = 1,896.97 × 777.28
  4. Step 4: Simplify right side
    1,374.71x = 1,474,470.16
  5. Step 5: Solve for x
    x = 1,474,470.16/1,374.71
  6. Step 6: Final answer
    x = 1,072.57

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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.