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Finding the Fourth Proportional to 772.11, 1,158.78 and 285.30

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Solution

The fourth proportional to 772.11, 1,158.78 and 285.30 is: 428.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.11 : 1,158.78 = 285.30 : x
  2. Step 2: Convert to fraction form
    772.11/1,158.78 = 285.30/x
  3. Step 3: Cross multiply
    772.11x = 1,158.78 × 285.30
  4. Step 4: Simplify right side
    772.11x = 330,602.12
  5. Step 5: Solve for x
    x = 330,602.12/772.11
  6. Step 6: Final answer
    x = 428.18

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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.