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Finding the Fourth Proportional to 2,071.47, 3,107.34 and 684.90

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Solution

The fourth proportional to 2,071.47, 3,107.34 and 684.90 is: 1,027.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,071.47 : 3,107.34 = 684.90 : x
  2. Step 2: Convert to fraction form
    2,071.47/3,107.34 = 684.90/x
  3. Step 3: Cross multiply
    2,071.47x = 3,107.34 × 684.90
  4. Step 4: Simplify right side
    2,071.47x = 2,128,217.17
  5. Step 5: Solve for x
    x = 2,128,217.17/2,071.47
  6. Step 6: Final answer
    x = 1,027.39

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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.