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Finding the Fourth Proportional to 20,487.63, 30,743.39 and 8,640.68

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Solution

The fourth proportional to 20,487.63, 30,743.39 and 8,640.68 is: 12,966.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.63 : 30,743.39 = 8,640.68 : x
  2. Step 2: Convert to fraction form
    20,487.63/30,743.39 = 8,640.68/x
  3. Step 3: Cross multiply
    20,487.63x = 30,743.39 × 8,640.68
  4. Step 4: Simplify right side
    20,487.63x = 265,643,598.18
  5. Step 5: Solve for x
    x = 265,643,598.18/20,487.63
  6. Step 6: Final answer
    x = 12,966.05

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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.