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Finding the Fourth Proportional to 12,955.15, 17,881.28 and 8,489.71

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Solution

The fourth proportional to 12,955.15, 17,881.28 and 8,489.71 is: 11,717.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,955.15 : 17,881.28 = 8,489.71 : x
  2. Step 2: Convert to fraction form
    12,955.15/17,881.28 = 8,489.71/x
  3. Step 3: Cross multiply
    12,955.15x = 17,881.28 × 8,489.71
  4. Step 4: Simplify right side
    12,955.15x = 151,806,881.63
  5. Step 5: Solve for x
    x = 151,806,881.63/12,955.15
  6. Step 6: Final answer
    x = 11,717.88

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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.