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Finding the Fourth Proportional to 1,126.92, 1,687.72 and 778.96

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Solution

The fourth proportional to 1,126.92, 1,687.72 and 778.96 is: 1,166.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.92 : 1,687.72 = 778.96 : x
  2. Step 2: Convert to fraction form
    1,126.92/1,687.72 = 778.96/x
  3. Step 3: Cross multiply
    1,126.92x = 1,687.72 × 778.96
  4. Step 4: Simplify right side
    1,126.92x = 1,314,666.37
  5. Step 5: Solve for x
    x = 1,314,666.37/1,126.92
  6. Step 6: Final answer
    x = 1,166.60

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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.