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Finding the Fourth Proportional to 1,075.92, 1,611.60 and 663.78

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Solution

The fourth proportional to 1,075.92, 1,611.60 and 663.78 is: 994.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.92 : 1,611.60 = 663.78 : x
  2. Step 2: Convert to fraction form
    1,075.92/1,611.60 = 663.78/x
  3. Step 3: Cross multiply
    1,075.92x = 1,611.60 × 663.78
  4. Step 4: Simplify right side
    1,075.92x = 1,069,747.85
  5. Step 5: Solve for x
    x = 1,069,747.85/1,075.92
  6. Step 6: Final answer
    x = 994.26

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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.