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Finding the Fourth Proportional to 744.72, 1,115.01 and 605.07

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Solution

The fourth proportional to 744.72, 1,115.01 and 605.07 is: 905.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.72 : 1,115.01 = 605.07 : x
  2. Step 2: Convert to fraction form
    744.72/1,115.01 = 605.07/x
  3. Step 3: Cross multiply
    744.72x = 1,115.01 × 605.07
  4. Step 4: Simplify right side
    744.72x = 674,659.10
  5. Step 5: Solve for x
    x = 674,659.10/744.72
  6. Step 6: Final answer
    x = 905.92

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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.