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Finding the Fourth Proportional to 661.87, 913.22 and 425.90

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Solution

The fourth proportional to 661.87, 913.22 and 425.90 is: 587.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.87 : 913.22 = 425.90 : x
  2. Step 2: Convert to fraction form
    661.87/913.22 = 425.90/x
  3. Step 3: Cross multiply
    661.87x = 913.22 × 425.90
  4. Step 4: Simplify right side
    661.87x = 388,936.90
  5. Step 5: Solve for x
    x = 388,936.90/661.87
  6. Step 6: Final answer
    x = 587.64

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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.