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Finding the Fourth Proportional to 772.23, 1,158.30 and 285.22

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Solution

The fourth proportional to 772.23, 1,158.30 and 285.22 is: 427.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.23 : 1,158.30 = 285.22 : x
  2. Step 2: Convert to fraction form
    772.23/1,158.30 = 285.22/x
  3. Step 3: Cross multiply
    772.23x = 1,158.30 × 285.22
  4. Step 4: Simplify right side
    772.23x = 330,371.77
  5. Step 5: Solve for x
    x = 330,371.77/772.23
  6. Step 6: Final answer
    x = 427.81

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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.