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Finding the Fourth Proportional to 772.48, 1,158.40 and 285.92

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Solution

The fourth proportional to 772.48, 1,158.40 and 285.92 is: 428.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.48 : 1,158.40 = 285.92 : x
  2. Step 2: Convert to fraction form
    772.48/1,158.40 = 285.92/x
  3. Step 3: Cross multiply
    772.48x = 1,158.40 × 285.92
  4. Step 4: Simplify right side
    772.48x = 331,209.73
  5. Step 5: Solve for x
    x = 331,209.73/772.48
  6. Step 6: Final answer
    x = 428.76

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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.