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Finding the Fourth Proportional to 772.16, 1,159.45 and 447.75

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Solution

The fourth proportional to 772.16, 1,159.45 and 447.75 is: 672.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.16 : 1,159.45 = 447.75 : x
  2. Step 2: Convert to fraction form
    772.16/1,159.45 = 447.75/x
  3. Step 3: Cross multiply
    772.16x = 1,159.45 × 447.75
  4. Step 4: Simplify right side
    772.16x = 519,142.62
  5. Step 5: Solve for x
    x = 519,142.62/772.16
  6. Step 6: Final answer
    x = 672.33

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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.