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Finding the Fourth Proportional to 918.80, 1,380.12 and 774.80

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Solution

The fourth proportional to 918.80, 1,380.12 and 774.80 is: 1,163.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.80 : 1,380.12 = 774.80 : x
  2. Step 2: Convert to fraction form
    918.80/1,380.12 = 774.80/x
  3. Step 3: Cross multiply
    918.80x = 1,380.12 × 774.80
  4. Step 4: Simplify right side
    918.80x = 1,069,316.98
  5. Step 5: Solve for x
    x = 1,069,316.98/918.80
  6. Step 6: Final answer
    x = 1,163.82

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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.