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Finding the Fourth Proportional to 2,119.79, 3,178.56 and 658.37

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Solution

The fourth proportional to 2,119.79, 3,178.56 and 658.37 is: 987.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.79 : 3,178.56 = 658.37 : x
  2. Step 2: Convert to fraction form
    2,119.79/3,178.56 = 658.37/x
  3. Step 3: Cross multiply
    2,119.79x = 3,178.56 × 658.37
  4. Step 4: Simplify right side
    2,119.79x = 2,092,668.55
  5. Step 5: Solve for x
    x = 2,092,668.55/2,119.79
  6. Step 6: Final answer
    x = 987.21

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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.