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Finding the Fourth Proportional to 3,978,764.93, 5,490,695.66 and 2,167,928.93

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Solution

The fourth proportional to 3,978,764.93, 5,490,695.66 and 2,167,928.93 is: 2,991,741.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978,764.93 : 5,490,695.66 = 2,167,928.93 : x
  2. Step 2: Convert to fraction form
    3,978,764.93/5,490,695.66 = 2,167,928.93/x
  3. Step 3: Cross multiply
    3,978,764.93x = 5,490,695.66 × 2,167,928.93
  4. Step 4: Simplify right side
    3,978,764.93x = 11,903,437,967,139.45
  5. Step 5: Solve for x
    x = 11,903,437,967,139.45/3,978,764.93
  6. Step 6: Final answer
    x = 2,991,741.95

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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.