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Finding the Fourth Proportional to 18,972.54, 28,469.16 and 12,737.76

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Solution

The fourth proportional to 18,972.54, 28,469.16 and 12,737.76 is: 19,113.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,972.54 : 28,469.16 = 12,737.76 : x
  2. Step 2: Convert to fraction form
    18,972.54/28,469.16 = 12,737.76/x
  3. Step 3: Cross multiply
    18,972.54x = 28,469.16 × 12,737.76
  4. Step 4: Simplify right side
    18,972.54x = 362,633,327.48
  5. Step 5: Solve for x
    x = 362,633,327.48/18,972.54
  6. Step 6: Final answer
    x = 19,113.59

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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.