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Finding the Fourth Proportional to 12,906.80, 19,381.80 and 8,543.60

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Solution

The fourth proportional to 12,906.80, 19,381.80 and 8,543.60 is: 12,829.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,906.80 : 19,381.80 = 8,543.60 : x
  2. Step 2: Convert to fraction form
    12,906.80/19,381.80 = 8,543.60/x
  3. Step 3: Cross multiply
    12,906.80x = 19,381.80 × 8,543.60
  4. Step 4: Simplify right side
    12,906.80x = 165,590,346.48
  5. Step 5: Solve for x
    x = 165,590,346.48/12,906.80
  6. Step 6: Final answer
    x = 12,829.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.