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Finding the Fourth Proportional to 3,406.78, 4,701 and 1,914.76

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Solution

The fourth proportional to 3,406.78, 4,701 and 1,914.76 is: 2,642.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,406.78 : 4,701 = 1,914.76 : x
  2. Step 2: Convert to fraction form
    3,406.78/4,701 = 1,914.76/x
  3. Step 3: Cross multiply
    3,406.78x = 4,701 × 1,914.76
  4. Step 4: Simplify right side
    3,406.78x = 9,001,286.76
  5. Step 5: Solve for x
    x = 9,001,286.76/3,406.78
  6. Step 6: Final answer
    x = 2,642.17

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Double scale
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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.