Home / 20,880.60-31,319.46-9,789.75

Finding the Fourth Proportional to 20,880.60, 31,319.46 and 9,789.75

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Solution

The fourth proportional to 20,880.60, 31,319.46 and 9,789.75 is: 14,683.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.60 : 31,319.46 = 9,789.75 : x
  2. Step 2: Convert to fraction form
    20,880.60/31,319.46 = 9,789.75/x
  3. Step 3: Cross multiply
    20,880.60x = 31,319.46 × 9,789.75
  4. Step 4: Simplify right side
    20,880.60x = 306,609,683.54
  5. Step 5: Solve for x
    x = 306,609,683.54/20,880.60
  6. Step 6: Final answer
    x = 14,683.95

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1.5x scale

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.