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Finding the Fourth Proportional to 774.53, 1,161.80 and 287.63

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Solution

The fourth proportional to 774.53, 1,161.80 and 287.63 is: 431.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.53 : 1,161.80 = 287.63 : x
  2. Step 2: Convert to fraction form
    774.53/1,161.80 = 287.63/x
  3. Step 3: Cross multiply
    774.53x = 1,161.80 × 287.63
  4. Step 4: Simplify right side
    774.53x = 334,168.53
  5. Step 5: Solve for x
    x = 334,168.53/774.53
  6. Step 6: Final answer
    x = 431.45

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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.