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Finding the Fourth Proportional to 3,978.58, 5,484.78 and 2,859.16

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Solution

The fourth proportional to 3,978.58, 5,484.78 and 2,859.16 is: 3,941.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.58 : 5,484.78 = 2,859.16 : x
  2. Step 2: Convert to fraction form
    3,978.58/5,484.78 = 2,859.16/x
  3. Step 3: Cross multiply
    3,978.58x = 5,484.78 × 2,859.16
  4. Step 4: Simplify right side
    3,978.58x = 15,681,863.58
  5. Step 5: Solve for x
    x = 15,681,863.58/3,978.58
  6. Step 6: Final answer
    x = 3,941.57

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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.