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Finding the Fourth Proportional to 1,128.69, 1,692.57 and 511.23

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Solution

The fourth proportional to 1,128.69, 1,692.57 and 511.23 is: 766.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.69 : 1,692.57 = 511.23 : x
  2. Step 2: Convert to fraction form
    1,128.69/1,692.57 = 511.23/x
  3. Step 3: Cross multiply
    1,128.69x = 1,692.57 × 511.23
  4. Step 4: Simplify right side
    1,128.69x = 865,292.56
  5. Step 5: Solve for x
    x = 865,292.56/1,128.69
  6. Step 6: Final answer
    x = 766.63

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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.