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Finding the Fourth Proportional to 661.75, 913.42 and 487.60

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Solution

The fourth proportional to 661.75, 913.42 and 487.60 is: 673.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.75 : 913.42 = 487.60 : x
  2. Step 2: Convert to fraction form
    661.75/913.42 = 487.60/x
  3. Step 3: Cross multiply
    661.75x = 913.42 × 487.60
  4. Step 4: Simplify right side
    661.75x = 445,382.37
  5. Step 5: Solve for x
    x = 445,382.37/661.75
  6. Step 6: Final answer
    x = 673.04

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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.