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Finding the Fourth Proportional to 20,908.88, 28,859.78 and 12,946.58

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Solution

The fourth proportional to 20,908.88, 28,859.78 and 12,946.58 is: 17,869.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.88 : 28,859.78 = 12,946.58 : x
  2. Step 2: Convert to fraction form
    20,908.88/28,859.78 = 12,946.58/x
  3. Step 3: Cross multiply
    20,908.88x = 28,859.78 × 12,946.58
  4. Step 4: Simplify right side
    20,908.88x = 373,635,450.55
  5. Step 5: Solve for x
    x = 373,635,450.55/20,908.88
  6. Step 6: Final answer
    x = 17,869.70

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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.