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Finding the Fourth Proportional to 772.12, 1,158.36 and 285.49

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Solution

The fourth proportional to 772.12, 1,158.36 and 285.49 is: 428.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.12 : 1,158.36 = 285.49 : x
  2. Step 2: Convert to fraction form
    772.12/1,158.36 = 285.49/x
  3. Step 3: Cross multiply
    772.12x = 1,158.36 × 285.49
  4. Step 4: Simplify right side
    772.12x = 330,700.20
  5. Step 5: Solve for x
    x = 330,700.20/772.12
  6. Step 6: Final answer
    x = 428.30

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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.