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Finding the Fourth Proportional to 743.40, 1,025.28 and 481.68

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Solution

The fourth proportional to 743.40, 1,025.28 and 481.68 is: 664.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.40 : 1,025.28 = 481.68 : x
  2. Step 2: Convert to fraction form
    743.40/1,025.28 = 481.68/x
  3. Step 3: Cross multiply
    743.40x = 1,025.28 × 481.68
  4. Step 4: Simplify right side
    743.40x = 493,856.87
  5. Step 5: Solve for x
    x = 493,856.87/743.40
  6. Step 6: Final answer
    x = 664.32

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.