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Finding the Fourth Proportional to 3,071.54, 4,608.21 and 991.50

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Solution

The fourth proportional to 3,071.54, 4,608.21 and 991.50 is: 1,487.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,071.54 : 4,608.21 = 991.50 : x
  2. Step 2: Convert to fraction form
    3,071.54/4,608.21 = 991.50/x
  3. Step 3: Cross multiply
    3,071.54x = 4,608.21 × 991.50
  4. Step 4: Simplify right side
    3,071.54x = 4,569,040.22
  5. Step 5: Solve for x
    x = 4,569,040.22/3,071.54
  6. Step 6: Final answer
    x = 1,487.54

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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.