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Finding the Fourth Proportional to 12,378.95, 17,076.59 and 8,129.39

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Solution

The fourth proportional to 12,378.95, 17,076.59 and 8,129.39 is: 11,214.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,378.95 : 17,076.59 = 8,129.39 : x
  2. Step 2: Convert to fraction form
    12,378.95/17,076.59 = 8,129.39/x
  3. Step 3: Cross multiply
    12,378.95x = 17,076.59 × 8,129.39
  4. Step 4: Simplify right side
    12,378.95x = 138,822,133.95
  5. Step 5: Solve for x
    x = 138,822,133.95/12,378.95
  6. Step 6: Final answer
    x = 11,214.38

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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.