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Finding the Fourth Proportional to 1,216.88, 1,678.89 and 692.80

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Solution

The fourth proportional to 1,216.88, 1,678.89 and 692.80 is: 955.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.88 : 1,678.89 = 692.80 : x
  2. Step 2: Convert to fraction form
    1,216.88/1,678.89 = 692.80/x
  3. Step 3: Cross multiply
    1,216.88x = 1,678.89 × 692.80
  4. Step 4: Simplify right side
    1,216.88x = 1,163,134.99
  5. Step 5: Solve for x
    x = 1,163,134.99/1,216.88
  6. Step 6: Final answer
    x = 955.83

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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.