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Finding the Fourth Proportional to 1,216.82, 1,679.19 and 692.84

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Solution

The fourth proportional to 1,216.82, 1,679.19 and 692.84 is: 956.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.82 : 1,679.19 = 692.84 : x
  2. Step 2: Convert to fraction form
    1,216.82/1,679.19 = 692.84/x
  3. Step 3: Cross multiply
    1,216.82x = 1,679.19 × 692.84
  4. Step 4: Simplify right side
    1,216.82x = 1,163,414.20
  5. Step 5: Solve for x
    x = 1,163,414.20/1,216.82
  6. Step 6: Final answer
    x = 956.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.