Home / 20,978,871.36-28,949,078.88-12,828,534.72

Finding the Fourth Proportional to 20,978,871.36, 28,949,078.88 and 12,828,534.72

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Solution

The fourth proportional to 20,978,871.36, 28,949,078.88 and 12,828,534.72 is: 17,702,299.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978,871.36 : 28,949,078.88 = 12,828,534.72 : x
  2. Step 2: Convert to fraction form
    20,978,871.36/28,949,078.88 = 12,828,534.72/x
  3. Step 3: Cross multiply
    20,978,871.36x = 28,949,078.88 × 12,828,534.72
  4. Step 4: Simplify right side
    20,978,871.36x = 371,374,263,524,098.75
  5. Step 5: Solve for x
    x = 371,374,263,524,098.75/20,978,871.36
  6. Step 6: Final answer
    x = 17,702,299.48

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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.