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Finding the Fourth Proportional to 1,128.42, 1,692.64 and 512.31

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Solution

The fourth proportional to 1,128.42, 1,692.64 and 512.31 is: 768.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.42 : 1,692.64 = 512.31 : x
  2. Step 2: Convert to fraction form
    1,128.42/1,692.64 = 512.31/x
  3. Step 3: Cross multiply
    1,128.42x = 1,692.64 × 512.31
  4. Step 4: Simplify right side
    1,128.42x = 867,163.39
  5. Step 5: Solve for x
    x = 867,163.39/1,128.42
  6. Step 6: Final answer
    x = 768.48

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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.