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Finding the Fourth Proportional to 3,894.68, 5,374.78 and 2,126.34

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Solution

The fourth proportional to 3,894.68, 5,374.78 and 2,126.34 is: 2,934.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,894.68 : 5,374.78 = 2,126.34 : x
  2. Step 2: Convert to fraction form
    3,894.68/5,374.78 = 2,126.34/x
  3. Step 3: Cross multiply
    3,894.68x = 5,374.78 × 2,126.34
  4. Step 4: Simplify right side
    3,894.68x = 11,428,609.71
  5. Step 5: Solve for x
    x = 11,428,609.71/3,894.68
  6. Step 6: Final answer
    x = 2,934.42

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1.5x scale

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.