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Finding the Fourth Proportional to 1,308.85, 1,964.61 and 692.44

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Solution

The fourth proportional to 1,308.85, 1,964.61 and 692.44 is: 1,039.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.85 : 1,964.61 = 692.44 : x
  2. Step 2: Convert to fraction form
    1,308.85/1,964.61 = 692.44/x
  3. Step 3: Cross multiply
    1,308.85x = 1,964.61 × 692.44
  4. Step 4: Simplify right side
    1,308.85x = 1,360,374.55
  5. Step 5: Solve for x
    x = 1,360,374.55/1,308.85
  6. Step 6: Final answer
    x = 1,039.37

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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.