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Finding the Fourth Proportional to 19,718.60, 27,211.64 and 12,645

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Solution

The fourth proportional to 19,718.60, 27,211.64 and 12,645 is: 17,450.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,718.60 : 27,211.64 = 12,645 : x
  2. Step 2: Convert to fraction form
    19,718.60/27,211.64 = 12,645/x
  3. Step 3: Cross multiply
    19,718.60x = 27,211.64 × 12,645
  4. Step 4: Simplify right side
    19,718.60x = 344,091,124.58
  5. Step 5: Solve for x
    x = 344,091,124.58/19,718.60
  6. Step 6: Final answer
    x = 17,450.08

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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.