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Finding the Fourth Proportional to 743.60, 1,025.40 and 660.56

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Solution

The fourth proportional to 743.60, 1,025.40 and 660.56 is: 910.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.60 : 1,025.40 = 660.56 : x
  2. Step 2: Convert to fraction form
    743.60/1,025.40 = 660.56/x
  3. Step 3: Cross multiply
    743.60x = 1,025.40 × 660.56
  4. Step 4: Simplify right side
    743.60x = 677,338.22
  5. Step 5: Solve for x
    x = 677,338.22/743.60
  6. Step 6: Final answer
    x = 910.89

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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.