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Finding the Fourth Proportional to 746.75, 1,120.57 and 308.21

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Solution

The fourth proportional to 746.75, 1,120.57 and 308.21 is: 462.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.75 : 1,120.57 = 308.21 : x
  2. Step 2: Convert to fraction form
    746.75/1,120.57 = 308.21/x
  3. Step 3: Cross multiply
    746.75x = 1,120.57 × 308.21
  4. Step 4: Simplify right side
    746.75x = 345,364.51
  5. Step 5: Solve for x
    x = 345,364.51/746.75
  6. Step 6: Final answer
    x = 462.49

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Half scale
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Double scale
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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.