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Finding the Fourth Proportional to 772.06, 1,157.28 and 284.80

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Solution

The fourth proportional to 772.06, 1,157.28 and 284.80 is: 426.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.06 : 1,157.28 = 284.80 : x
  2. Step 2: Convert to fraction form
    772.06/1,157.28 = 284.80/x
  3. Step 3: Cross multiply
    772.06x = 1,157.28 × 284.80
  4. Step 4: Simplify right side
    772.06x = 329,593.34
  5. Step 5: Solve for x
    x = 329,593.34/772.06
  6. Step 6: Final answer
    x = 426.90

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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.