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Finding the Fourth Proportional to 768.92, 1,153.40 and 561.33

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Solution

The fourth proportional to 768.92, 1,153.40 and 561.33 is: 842.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.92 : 1,153.40 = 561.33 : x
  2. Step 2: Convert to fraction form
    768.92/1,153.40 = 561.33/x
  3. Step 3: Cross multiply
    768.92x = 1,153.40 × 561.33
  4. Step 4: Simplify right side
    768.92x = 647,435.22
  5. Step 5: Solve for x
    x = 647,435.22/768.92
  6. Step 6: Final answer
    x = 842.01

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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.