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Finding the Fourth Proportional to 1,228.98, 1,839.14 and 766.98

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Solution

The fourth proportional to 1,228.98, 1,839.14 and 766.98 is: 1,147.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.98 : 1,839.14 = 766.98 : x
  2. Step 2: Convert to fraction form
    1,228.98/1,839.14 = 766.98/x
  3. Step 3: Cross multiply
    1,228.98x = 1,839.14 × 766.98
  4. Step 4: Simplify right side
    1,228.98x = 1,410,572.48
  5. Step 5: Solve for x
    x = 1,410,572.48/1,228.98
  6. Step 6: Final answer
    x = 1,147.76

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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.