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Finding the Fourth Proportional to 842.39, 1,262.70 and 581.54

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Solution

The fourth proportional to 842.39, 1,262.70 and 581.54 is: 871.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.39 : 1,262.70 = 581.54 : x
  2. Step 2: Convert to fraction form
    842.39/1,262.70 = 581.54/x
  3. Step 3: Cross multiply
    842.39x = 1,262.70 × 581.54
  4. Step 4: Simplify right side
    842.39x = 734,313.26
  5. Step 5: Solve for x
    x = 734,313.26/842.39
  6. Step 6: Final answer
    x = 871.70

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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.