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Finding the Fourth Proportional to 12,138.61, 16,751.31 and 6,761.00

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Solution

The fourth proportional to 12,138.61, 16,751.31 and 6,761.00 is: 9,330.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.61 : 16,751.31 = 6,761.00 : x
  2. Step 2: Convert to fraction form
    12,138.61/16,751.31 = 6,761.00/x
  3. Step 3: Cross multiply
    12,138.61x = 16,751.31 × 6,761.00
  4. Step 4: Simplify right side
    12,138.61x = 113,255,669.73
  5. Step 5: Solve for x
    x = 113,255,669.73/12,138.61
  6. Step 6: Final answer
    x = 9,330.20

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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.