Home / 20,639.43-30,964.61-12,643.31

Finding the Fourth Proportional to 20,639.43, 30,964.61 and 12,643.31

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Solution

The fourth proportional to 20,639.43, 30,964.61 and 12,643.31 is: 18,968.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.43 : 30,964.61 = 12,643.31 : x
  2. Step 2: Convert to fraction form
    20,639.43/30,964.61 = 12,643.31/x
  3. Step 3: Cross multiply
    20,639.43x = 30,964.61 × 12,643.31
  4. Step 4: Simplify right side
    20,639.43x = 391,495,272.28
  5. Step 5: Solve for x
    x = 391,495,272.28/20,639.43
  6. Step 6: Final answer
    x = 18,968.32

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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.