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Finding the Fourth Proportional to 792.87, 1,187.77 and 445.15

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Solution

The fourth proportional to 792.87, 1,187.77 and 445.15 is: 666.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.87 : 1,187.77 = 445.15 : x
  2. Step 2: Convert to fraction form
    792.87/1,187.77 = 445.15/x
  3. Step 3: Cross multiply
    792.87x = 1,187.77 × 445.15
  4. Step 4: Simplify right side
    792.87x = 528,735.82
  5. Step 5: Solve for x
    x = 528,735.82/792.87
  6. Step 6: Final answer
    x = 666.86

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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.