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Finding the Fourth Proportional to 15,171.68, 20,957.60 and 12,838.88

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Solution

The fourth proportional to 15,171.68, 20,957.60 and 12,838.88 is: 17,735.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.68 : 20,957.60 = 12,838.88 : x
  2. Step 2: Convert to fraction form
    15,171.68/20,957.60 = 12,838.88/x
  3. Step 3: Cross multiply
    15,171.68x = 20,957.60 × 12,838.88
  4. Step 4: Simplify right side
    15,171.68x = 269,072,111.49
  5. Step 5: Solve for x
    x = 269,072,111.49/15,171.68
  6. Step 6: Final answer
    x = 17,735.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.