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Finding the Fourth Proportional to 1,235.34, 1,704.78 and 769.50

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Solution

The fourth proportional to 1,235.34, 1,704.78 and 769.50 is: 1,061.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.34 : 1,704.78 = 769.50 : x
  2. Step 2: Convert to fraction form
    1,235.34/1,704.78 = 769.50/x
  3. Step 3: Cross multiply
    1,235.34x = 1,704.78 × 769.50
  4. Step 4: Simplify right side
    1,235.34x = 1,311,828.21
  5. Step 5: Solve for x
    x = 1,311,828.21/1,235.34
  6. Step 6: Final answer
    x = 1,061.92

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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.