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Finding the Fourth Proportional to 1,234.98, 1,705.05 and 769.50

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Solution

The fourth proportional to 1,234.98, 1,705.05 and 769.50 is: 1,062.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.98 : 1,705.05 = 769.50 : x
  2. Step 2: Convert to fraction form
    1,234.98/1,705.05 = 769.50/x
  3. Step 3: Cross multiply
    1,234.98x = 1,705.05 × 769.50
  4. Step 4: Simplify right side
    1,234.98x = 1,312,035.98
  5. Step 5: Solve for x
    x = 1,312,035.98/1,234.98
  6. Step 6: Final answer
    x = 1,062.39

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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.