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Finding the Fourth Proportional to 1,129.55, 1,692.83 and 689.45

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Solution

The fourth proportional to 1,129.55, 1,692.83 and 689.45 is: 1,033.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.55 : 1,692.83 = 689.45 : x
  2. Step 2: Convert to fraction form
    1,129.55/1,692.83 = 689.45/x
  3. Step 3: Cross multiply
    1,129.55x = 1,692.83 × 689.45
  4. Step 4: Simplify right side
    1,129.55x = 1,167,114.90
  5. Step 5: Solve for x
    x = 1,167,114.90/1,129.55
  6. Step 6: Final answer
    x = 1,033.26

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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.