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Finding the Fourth Proportional to 1,129.60, 1,692.24 and 762.58

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Solution

The fourth proportional to 1,129.60, 1,692.24 and 762.58 is: 1,142.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.60 : 1,692.24 = 762.58 : x
  2. Step 2: Convert to fraction form
    1,129.60/1,692.24 = 762.58/x
  3. Step 3: Cross multiply
    1,129.60x = 1,692.24 × 762.58
  4. Step 4: Simplify right side
    1,129.60x = 1,290,468.38
  5. Step 5: Solve for x
    x = 1,290,468.38/1,129.60
  6. Step 6: Final answer
    x = 1,142.41

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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.