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Finding the Fourth Proportional to 3,906.68, 5,386.38 and 3,157.88

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Solution

The fourth proportional to 3,906.68, 5,386.38 and 3,157.88 is: 4,353.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.68 : 5,386.38 = 3,157.88 : x
  2. Step 2: Convert to fraction form
    3,906.68/5,386.38 = 3,157.88/x
  3. Step 3: Cross multiply
    3,906.68x = 5,386.38 × 3,157.88
  4. Step 4: Simplify right side
    3,906.68x = 17,009,541.67
  5. Step 5: Solve for x
    x = 17,009,541.67/3,906.68
  6. Step 6: Final answer
    x = 4,353.96

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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.