Home / 21,078.60-31,619.70-6,286.56

Finding the Fourth Proportional to 21,078.60, 31,619.70 and 6,286.56

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Solution

The fourth proportional to 21,078.60, 31,619.70 and 6,286.56 is: 9,430.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.60 : 31,619.70 = 6,286.56 : x
  2. Step 2: Convert to fraction form
    21,078.60/31,619.70 = 6,286.56/x
  3. Step 3: Cross multiply
    21,078.60x = 31,619.70 × 6,286.56
  4. Step 4: Simplify right side
    21,078.60x = 198,779,141.23
  5. Step 5: Solve for x
    x = 198,779,141.23/21,078.60
  6. Step 6: Final answer
    x = 9,430.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.