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Finding the Fourth Proportional to 744.92, 1,115.55 and 614.12

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Solution

The fourth proportional to 744.92, 1,115.55 and 614.12 is: 919.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.92 : 1,115.55 = 614.12 : x
  2. Step 2: Convert to fraction form
    744.92/1,115.55 = 614.12/x
  3. Step 3: Cross multiply
    744.92x = 1,115.55 × 614.12
  4. Step 4: Simplify right side
    744.92x = 685,081.57
  5. Step 5: Solve for x
    x = 685,081.57/744.92
  6. Step 6: Final answer
    x = 919.67

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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.