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Finding the Fourth Proportional to 20,980.64, 31,458.72 and 8,506.64

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Solution

The fourth proportional to 20,980.64, 31,458.72 and 8,506.64 is: 12,755.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.64 : 31,458.72 = 8,506.64 : x
  2. Step 2: Convert to fraction form
    20,980.64/31,458.72 = 8,506.64/x
  3. Step 3: Cross multiply
    20,980.64x = 31,458.72 × 8,506.64
  4. Step 4: Simplify right side
    20,980.64x = 267,608,005.90
  5. Step 5: Solve for x
    x = 267,608,005.90/20,980.64
  6. Step 6: Final answer
    x = 12,755.00

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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.