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Finding the Fourth Proportional to 792.74, 1,189.61 and 427.77

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Solution

The fourth proportional to 792.74, 1,189.61 and 427.77 is: 641.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.74 : 1,189.61 = 427.77 : x
  2. Step 2: Convert to fraction form
    792.74/1,189.61 = 427.77/x
  3. Step 3: Cross multiply
    792.74x = 1,189.61 × 427.77
  4. Step 4: Simplify right side
    792.74x = 508,877.33
  5. Step 5: Solve for x
    x = 508,877.33/792.74
  6. Step 6: Final answer
    x = 641.93

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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.