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Finding the Fourth Proportional to 1,081.79, 1,621.85 and 734.21

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Solution

The fourth proportional to 1,081.79, 1,621.85 and 734.21 is: 1,100.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.79 : 1,621.85 = 734.21 : x
  2. Step 2: Convert to fraction form
    1,081.79/1,621.85 = 734.21/x
  3. Step 3: Cross multiply
    1,081.79x = 1,621.85 × 734.21
  4. Step 4: Simplify right side
    1,081.79x = 1,190,772.60
  5. Step 5: Solve for x
    x = 1,190,772.60/1,081.79
  6. Step 6: Final answer
    x = 1,100.75

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1.5x scale

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.