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Finding the Fourth Proportional to 692.78, 1,039.18 and 650.54

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Solution

The fourth proportional to 692.78, 1,039.18 and 650.54 is: 975.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.78 : 1,039.18 = 650.54 : x
  2. Step 2: Convert to fraction form
    692.78/1,039.18 = 650.54/x
  3. Step 3: Cross multiply
    692.78x = 1,039.18 × 650.54
  4. Step 4: Simplify right side
    692.78x = 676,028.16
  5. Step 5: Solve for x
    x = 676,028.16/692.78
  6. Step 6: Final answer
    x = 975.82

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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.