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Finding the Fourth Proportional to 20,976.60, 31,464.90 and 7,125.60

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Solution

The fourth proportional to 20,976.60, 31,464.90 and 7,125.60 is: 10,688.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.60 : 31,464.90 = 7,125.60 : x
  2. Step 2: Convert to fraction form
    20,976.60/31,464.90 = 7,125.60/x
  3. Step 3: Cross multiply
    20,976.60x = 31,464.90 × 7,125.60
  4. Step 4: Simplify right side
    20,976.60x = 224,206,291.44
  5. Step 5: Solve for x
    x = 224,206,291.44/20,976.60
  6. Step 6: Final answer
    x = 10,688.40

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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.