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Finding the Fourth Proportional to 18,703.31, 25,813.03 and 11,897.99

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Solution

The fourth proportional to 18,703.31, 25,813.03 and 11,897.99 is: 16,420.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,703.31 : 25,813.03 = 11,897.99 : x
  2. Step 2: Convert to fraction form
    18,703.31/25,813.03 = 11,897.99/x
  3. Step 3: Cross multiply
    18,703.31x = 25,813.03 × 11,897.99
  4. Step 4: Simplify right side
    18,703.31x = 307,123,133.11
  5. Step 5: Solve for x
    x = 307,123,133.11/18,703.31
  6. Step 6: Final answer
    x = 16,420.79

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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.