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Finding the Fourth Proportional to 743.06, 1,115.86 and 619.54

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Solution

The fourth proportional to 743.06, 1,115.86 and 619.54 is: 930.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.06 : 1,115.86 = 619.54 : x
  2. Step 2: Convert to fraction form
    743.06/1,115.86 = 619.54/x
  3. Step 3: Cross multiply
    743.06x = 1,115.86 × 619.54
  4. Step 4: Simplify right side
    743.06x = 691,319.90
  5. Step 5: Solve for x
    x = 691,319.90/743.06
  6. Step 6: Final answer
    x = 930.37

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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.