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Finding the Fourth Proportional to 18,636.63, 25,719.01 and 10,139.23

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Solution

The fourth proportional to 18,636.63, 25,719.01 and 10,139.23 is: 13,992.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,636.63 : 25,719.01 = 10,139.23 : x
  2. Step 2: Convert to fraction form
    18,636.63/25,719.01 = 10,139.23/x
  3. Step 3: Cross multiply
    18,636.63x = 25,719.01 × 10,139.23
  4. Step 4: Simplify right side
    18,636.63x = 260,770,957.76
  5. Step 5: Solve for x
    x = 260,770,957.76/18,636.63
  6. Step 6: Final answer
    x = 13,992.39

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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.