Home / 20,921.60-31,382.76-5,339.36

Finding the Fourth Proportional to 20,921.60, 31,382.76 and 5,339.36

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Solution

The fourth proportional to 20,921.60, 31,382.76 and 5,339.36 is: 8,009.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.60 : 31,382.76 = 5,339.36 : x
  2. Step 2: Convert to fraction form
    20,921.60/31,382.76 = 5,339.36/x
  3. Step 3: Cross multiply
    20,921.60x = 31,382.76 × 5,339.36
  4. Step 4: Simplify right side
    20,921.60x = 167,563,853.43
  5. Step 5: Solve for x
    x = 167,563,853.43/20,921.60
  6. Step 6: Final answer
    x = 8,009.13

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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.