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Finding the Fourth Proportional to 5,419.31, 8,129.03 and 1,721.66

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Solution

The fourth proportional to 5,419.31, 8,129.03 and 1,721.66 is: 2,582.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.31 : 8,129.03 = 1,721.66 : x
  2. Step 2: Convert to fraction form
    5,419.31/8,129.03 = 1,721.66/x
  3. Step 3: Cross multiply
    5,419.31x = 8,129.03 × 1,721.66
  4. Step 4: Simplify right side
    5,419.31x = 13,995,376.54
  5. Step 5: Solve for x
    x = 13,995,376.54/5,419.31
  6. Step 6: Final answer
    x = 2,582.50

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Double scale
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Similar ratio
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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.