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Finding the Fourth Proportional to 2,119.78, 3,179.71 and 658.89

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Solution

The fourth proportional to 2,119.78, 3,179.71 and 658.89 is: 988.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.78 : 3,179.71 = 658.89 : x
  2. Step 2: Convert to fraction form
    2,119.78/3,179.71 = 658.89/x
  3. Step 3: Cross multiply
    2,119.78x = 3,179.71 × 658.89
  4. Step 4: Simplify right side
    2,119.78x = 2,095,079.12
  5. Step 5: Solve for x
    x = 2,095,079.12/2,119.78
  6. Step 6: Final answer
    x = 988.35

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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.