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Finding the Fourth Proportional to 772.08, 1,156.92 and 285

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Solution

The fourth proportional to 772.08, 1,156.92 and 285 is: 427.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.08 : 1,156.92 = 285 : x
  2. Step 2: Convert to fraction form
    772.08/1,156.92 = 285/x
  3. Step 3: Cross multiply
    772.08x = 1,156.92 × 285
  4. Step 4: Simplify right side
    772.08x = 329,722.20
  5. Step 5: Solve for x
    x = 329,722.20/772.08
  6. Step 6: Final answer
    x = 427.06

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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.