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Finding the Fourth Proportional to 1,692.20, 2,538.66 and 718.76

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Solution

The fourth proportional to 1,692.20, 2,538.66 and 718.76 is: 1,078.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,692.20 : 2,538.66 = 718.76 : x
  2. Step 2: Convert to fraction form
    1,692.20/2,538.66 = 718.76/x
  3. Step 3: Cross multiply
    1,692.20x = 2,538.66 × 718.76
  4. Step 4: Simplify right side
    1,692.20x = 1,824,687.26
  5. Step 5: Solve for x
    x = 1,824,687.26/1,692.20
  6. Step 6: Final answer
    x = 1,078.29

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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.