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Finding the Fourth Proportional to 12,856.74, 17,721.12 and 8,606.28

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Solution

The fourth proportional to 12,856.74, 17,721.12 and 8,606.28 is: 11,862.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,856.74 : 17,721.12 = 8,606.28 : x
  2. Step 2: Convert to fraction form
    12,856.74/17,721.12 = 8,606.28/x
  3. Step 3: Cross multiply
    12,856.74x = 17,721.12 × 8,606.28
  4. Step 4: Simplify right side
    12,856.74x = 152,512,920.63
  5. Step 5: Solve for x
    x = 152,512,920.63/12,856.74
  6. Step 6: Final answer
    x = 11,862.49

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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.