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Finding the Fourth Proportional to 1,190.78, 1,784.20 and 842.39

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Solution

The fourth proportional to 1,190.78, 1,784.20 and 842.39 is: 1,262.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.78 : 1,784.20 = 842.39 : x
  2. Step 2: Convert to fraction form
    1,190.78/1,784.20 = 842.39/x
  3. Step 3: Cross multiply
    1,190.78x = 1,784.20 × 842.39
  4. Step 4: Simplify right side
    1,190.78x = 1,502,989.48
  5. Step 5: Solve for x
    x = 1,502,989.48/1,190.78
  6. Step 6: Final answer
    x = 1,262.18

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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.