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Finding the Fourth Proportional to 774.68, 1,161.71 and 287.77

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Solution

The fourth proportional to 774.68, 1,161.71 and 287.77 is: 431.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.68 : 1,161.71 = 287.77 : x
  2. Step 2: Convert to fraction form
    774.68/1,161.71 = 287.77/x
  3. Step 3: Cross multiply
    774.68x = 1,161.71 × 287.77
  4. Step 4: Simplify right side
    774.68x = 334,305.29
  5. Step 5: Solve for x
    x = 334,305.29/774.68
  6. Step 6: Final answer
    x = 431.54

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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.