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Finding the Fourth Proportional to 20,486.45, 30,741.60 and 8,639.51

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Solution

The fourth proportional to 20,486.45, 30,741.60 and 8,639.51 is: 12,964.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.45 : 30,741.60 = 8,639.51 : x
  2. Step 2: Convert to fraction form
    20,486.45/30,741.60 = 8,639.51/x
  3. Step 3: Cross multiply
    20,486.45x = 30,741.60 × 8,639.51
  4. Step 4: Simplify right side
    20,486.45x = 265,592,206.91
  5. Step 5: Solve for x
    x = 265,592,206.91/20,486.45
  6. Step 6: Final answer
    x = 12,964.29

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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.