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Finding the Fourth Proportional to 743.52, 1,025.60 and 656.40

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Solution

The fourth proportional to 743.52, 1,025.60 and 656.40 is: 905.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.52 : 1,025.60 = 656.40 : x
  2. Step 2: Convert to fraction form
    743.52/1,025.60 = 656.40/x
  3. Step 3: Cross multiply
    743.52x = 1,025.60 × 656.40
  4. Step 4: Simplify right side
    743.52x = 673,203.84
  5. Step 5: Solve for x
    x = 673,203.84/743.52
  6. Step 6: Final answer
    x = 905.43

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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.