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Finding the Fourth Proportional to 1,265.79, 1,896.60 and 777.81

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Solution

The fourth proportional to 1,265.79, 1,896.60 and 777.81 is: 1,165.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.79 : 1,896.60 = 777.81 : x
  2. Step 2: Convert to fraction form
    1,265.79/1,896.60 = 777.81/x
  3. Step 3: Cross multiply
    1,265.79x = 1,896.60 × 777.81
  4. Step 4: Simplify right side
    1,265.79x = 1,475,194.45
  5. Step 5: Solve for x
    x = 1,475,194.45/1,265.79
  6. Step 6: Final answer
    x = 1,165.43

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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.