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Finding the Fourth Proportional to 774.13, 1,161.48 and 287.23

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Solution

The fourth proportional to 774.13, 1,161.48 and 287.23 is: 430.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.13 : 1,161.48 = 287.23 : x
  2. Step 2: Convert to fraction form
    774.13/1,161.48 = 287.23/x
  3. Step 3: Cross multiply
    774.13x = 1,161.48 × 287.23
  4. Step 4: Simplify right side
    774.13x = 333,611.90
  5. Step 5: Solve for x
    x = 333,611.90/774.13
  6. Step 6: Final answer
    x = 430.95

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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.