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Finding the Fourth Proportional to 12,640.86, 18,877.46 and 12,503.57

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Solution

The fourth proportional to 12,640.86, 18,877.46 and 12,503.57 is: 18,672.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.86 : 18,877.46 = 12,503.57 : x
  2. Step 2: Convert to fraction form
    12,640.86/18,877.46 = 12,503.57/x
  3. Step 3: Cross multiply
    12,640.86x = 18,877.46 × 12,503.57
  4. Step 4: Simplify right side
    12,640.86x = 236,035,485.63
  5. Step 5: Solve for x
    x = 236,035,485.63/12,640.86
  6. Step 6: Final answer
    x = 18,672.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.