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Finding the Fourth Proportional to 15,170.88, 20,936.40 and 12,648.74

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Solution

The fourth proportional to 15,170.88, 20,936.40 and 12,648.74 is: 17,455.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,170.88 : 20,936.40 = 12,648.74 : x
  2. Step 2: Convert to fraction form
    15,170.88/20,936.40 = 12,648.74/x
  3. Step 3: Cross multiply
    15,170.88x = 20,936.40 × 12,648.74
  4. Step 4: Simplify right side
    15,170.88x = 264,819,080.14
  5. Step 5: Solve for x
    x = 264,819,080.14/15,170.88
  6. Step 6: Final answer
    x = 17,455.75

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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.