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Finding the Fourth Proportional to 3,978.45, 5,487.93 and 2,718.90

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Solution

The fourth proportional to 3,978.45, 5,487.93 and 2,718.90 is: 3,750.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.45 : 5,487.93 = 2,718.90 : x
  2. Step 2: Convert to fraction form
    3,978.45/5,487.93 = 2,718.90/x
  3. Step 3: Cross multiply
    3,978.45x = 5,487.93 × 2,718.90
  4. Step 4: Simplify right side
    3,978.45x = 14,921,132.88
  5. Step 5: Solve for x
    x = 14,921,132.88/3,978.45
  6. Step 6: Final answer
    x = 3,750.49

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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.