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Finding the Fourth Proportional to 12,963.80, 17,881.98 and 8,485.40

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Solution

The fourth proportional to 12,963.80, 17,881.98 and 8,485.40 is: 11,704.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,963.80 : 17,881.98 = 8,485.40 : x
  2. Step 2: Convert to fraction form
    12,963.80/17,881.98 = 8,485.40/x
  3. Step 3: Cross multiply
    12,963.80x = 17,881.98 × 8,485.40
  4. Step 4: Simplify right side
    12,963.80x = 151,735,753.09
  5. Step 5: Solve for x
    x = 151,735,753.09/12,963.80
  6. Step 6: Final answer
    x = 11,704.57

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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.