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Finding the Fourth Proportional to 1,126.85, 1,555.16 and 629.64

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Solution

The fourth proportional to 1,126.85, 1,555.16 and 629.64 is: 868.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.85 : 1,555.16 = 629.64 : x
  2. Step 2: Convert to fraction form
    1,126.85/1,555.16 = 629.64/x
  3. Step 3: Cross multiply
    1,126.85x = 1,555.16 × 629.64
  4. Step 4: Simplify right side
    1,126.85x = 979,187.79
  5. Step 5: Solve for x
    x = 979,187.79/1,126.85
  6. Step 6: Final answer
    x = 868.96

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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.