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Finding the Fourth Proportional to 18,696.60, 27,980.10 and 12,864.60

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Solution

The fourth proportional to 18,696.60, 27,980.10 and 12,864.60 is: 19,252.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,696.60 : 27,980.10 = 12,864.60 : x
  2. Step 2: Convert to fraction form
    18,696.60/27,980.10 = 12,864.60/x
  3. Step 3: Cross multiply
    18,696.60x = 27,980.10 × 12,864.60
  4. Step 4: Simplify right side
    18,696.60x = 359,952,794.46
  5. Step 5: Solve for x
    x = 359,952,794.46/18,696.60
  6. Step 6: Final answer
    x = 19,252.31

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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.