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Finding the Fourth Proportional to 2,666.70, 3,992.13 and 1,976.40

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Solution

The fourth proportional to 2,666.70, 3,992.13 and 1,976.40 is: 2,958.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.70 : 3,992.13 = 1,976.40 : x
  2. Step 2: Convert to fraction form
    2,666.70/3,992.13 = 1,976.40/x
  3. Step 3: Cross multiply
    2,666.70x = 3,992.13 × 1,976.40
  4. Step 4: Simplify right side
    2,666.70x = 7,890,045.73
  5. Step 5: Solve for x
    x = 7,890,045.73/2,666.70
  6. Step 6: Final answer
    x = 2,958.73

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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.