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Finding the Fourth Proportional to 891.30, 1,230.90 and 692.88

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Solution

The fourth proportional to 891.30, 1,230.90 and 692.88 is: 956.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.30 : 1,230.90 = 692.88 : x
  2. Step 2: Convert to fraction form
    891.30/1,230.90 = 692.88/x
  3. Step 3: Cross multiply
    891.30x = 1,230.90 × 692.88
  4. Step 4: Simplify right side
    891.30x = 852,865.99
  5. Step 5: Solve for x
    x = 852,865.99/891.30
  6. Step 6: Final answer
    x = 956.88

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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.