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Finding the Fourth Proportional to 1,975.21, 2,961.71 and 658.60

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Solution

The fourth proportional to 1,975.21, 2,961.71 and 658.60 is: 987.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,975.21 : 2,961.71 = 658.60 : x
  2. Step 2: Convert to fraction form
    1,975.21/2,961.71 = 658.60/x
  3. Step 3: Cross multiply
    1,975.21x = 2,961.71 × 658.60
  4. Step 4: Simplify right side
    1,975.21x = 1,950,578.91
  5. Step 5: Solve for x
    x = 1,950,578.91/1,975.21
  6. Step 6: Final answer
    x = 987.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.