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Finding the Fourth Proportional to 12,129.80, 16,738.80 and 6,825.74

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Solution

The fourth proportional to 12,129.80, 16,738.80 and 6,825.74 is: 9,419.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,129.80 : 16,738.80 = 6,825.74 : x
  2. Step 2: Convert to fraction form
    12,129.80/16,738.80 = 6,825.74/x
  3. Step 3: Cross multiply
    12,129.80x = 16,738.80 × 6,825.74
  4. Step 4: Simplify right side
    12,129.80x = 114,254,696.71
  5. Step 5: Solve for x
    x = 114,254,696.71/12,129.80
  6. Step 6: Final answer
    x = 9,419.34

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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.