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Finding the Fourth Proportional to 18,765.99, 25,890.78 and 10,808.06

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Solution

The fourth proportional to 18,765.99, 25,890.78 and 10,808.06 is: 14,911.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.99 : 25,890.78 = 10,808.06 : x
  2. Step 2: Convert to fraction form
    18,765.99/25,890.78 = 10,808.06/x
  3. Step 3: Cross multiply
    18,765.99x = 25,890.78 × 10,808.06
  4. Step 4: Simplify right side
    18,765.99x = 279,828,974.23
  5. Step 5: Solve for x
    x = 279,828,974.23/18,765.99
  6. Step 6: Final answer
    x = 14,911.50

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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.