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Finding the Fourth Proportional to 792.09, 1,187.17 and 561.05

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Solution

The fourth proportional to 792.09, 1,187.17 and 561.05 is: 840.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.09 : 1,187.17 = 561.05 : x
  2. Step 2: Convert to fraction form
    792.09/1,187.17 = 561.05/x
  3. Step 3: Cross multiply
    792.09x = 1,187.17 × 561.05
  4. Step 4: Simplify right side
    792.09x = 666,055.79
  5. Step 5: Solve for x
    x = 666,055.79/792.09
  6. Step 6: Final answer
    x = 840.88

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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.