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Finding the Fourth Proportional to 18,763.87, 25,882.86 and 12,390.52

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Solution

The fourth proportional to 18,763.87, 25,882.86 and 12,390.52 is: 17,091.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,763.87 : 25,882.86 = 12,390.52 : x
  2. Step 2: Convert to fraction form
    18,763.87/25,882.86 = 12,390.52/x
  3. Step 3: Cross multiply
    18,763.87x = 25,882.86 × 12,390.52
  4. Step 4: Simplify right side
    18,763.87x = 320,702,094.49
  5. Step 5: Solve for x
    x = 320,702,094.49/18,763.87
  6. Step 6: Final answer
    x = 17,091.47

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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.