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Finding the Fourth Proportional to 774.66, 1,161.47 and 287.45

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Solution

The fourth proportional to 774.66, 1,161.47 and 287.45 is: 430.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.66 : 1,161.47 = 287.45 : x
  2. Step 2: Convert to fraction form
    774.66/1,161.47 = 287.45/x
  3. Step 3: Cross multiply
    774.66x = 1,161.47 × 287.45
  4. Step 4: Simplify right side
    774.66x = 333,857.31
  5. Step 5: Solve for x
    x = 333,857.31/774.66
  6. Step 6: Final answer
    x = 430.97

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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.