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Finding the Fourth Proportional to 792.90, 1,190.07 and 561.87

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Solution

The fourth proportional to 792.90, 1,190.07 and 561.87 is: 843.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.90 : 1,190.07 = 561.87 : x
  2. Step 2: Convert to fraction form
    792.90/1,190.07 = 561.87/x
  3. Step 3: Cross multiply
    792.90x = 1,190.07 × 561.87
  4. Step 4: Simplify right side
    792.90x = 668,664.63
  5. Step 5: Solve for x
    x = 668,664.63/792.90
  6. Step 6: Final answer
    x = 843.32

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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.