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Finding the Fourth Proportional to 3,071.71, 4,608.21 and 991.83

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Solution

The fourth proportional to 3,071.71, 4,608.21 and 991.83 is: 1,487.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,071.71 : 4,608.21 = 991.83 : x
  2. Step 2: Convert to fraction form
    3,071.71/4,608.21 = 991.83/x
  3. Step 3: Cross multiply
    3,071.71x = 4,608.21 × 991.83
  4. Step 4: Simplify right side
    3,071.71x = 4,570,537.88
  5. Step 5: Solve for x
    x = 4,570,537.88/3,071.71
  6. Step 6: Final answer
    x = 1,487.95

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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.