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Finding the Fourth Proportional to 12,881.21, 17,867.01 and 12,539.79

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Solution

The fourth proportional to 12,881.21, 17,867.01 and 12,539.79 is: 17,393.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,881.21 : 17,867.01 = 12,539.79 : x
  2. Step 2: Convert to fraction form
    12,881.21/17,867.01 = 12,539.79/x
  3. Step 3: Cross multiply
    12,881.21x = 17,867.01 × 12,539.79
  4. Step 4: Simplify right side
    12,881.21x = 224,048,553.33
  5. Step 5: Solve for x
    x = 224,048,553.33/12,881.21
  6. Step 6: Final answer
    x = 17,393.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.