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Finding the Fourth Proportional to 792.69, 1,188.28 and 427.51

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Solution

The fourth proportional to 792.69, 1,188.28 and 427.51 is: 640.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.69 : 1,188.28 = 427.51 : x
  2. Step 2: Convert to fraction form
    792.69/1,188.28 = 427.51/x
  3. Step 3: Cross multiply
    792.69x = 1,188.28 × 427.51
  4. Step 4: Simplify right side
    792.69x = 508,001.58
  5. Step 5: Solve for x
    x = 508,001.58/792.69
  6. Step 6: Final answer
    x = 640.86

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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.