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Finding the Fourth Proportional to 2,692.78, 4,039.18 and 745

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Solution

The fourth proportional to 2,692.78, 4,039.18 and 745 is: 1,117.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,692.78 : 4,039.18 = 745 : x
  2. Step 2: Convert to fraction form
    2,692.78/4,039.18 = 745/x
  3. Step 3: Cross multiply
    2,692.78x = 4,039.18 × 745
  4. Step 4: Simplify right side
    2,692.78x = 3,009,189.10
  5. Step 5: Solve for x
    x = 3,009,189.10/2,692.78
  6. Step 6: Final answer
    x = 1,117.50

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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.