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Finding the Fourth Proportional to 15,493.01, 21,379.89 and 8,419.45

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Solution

The fourth proportional to 15,493.01, 21,379.89 and 8,419.45 is: 11,618.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,493.01 : 21,379.89 = 8,419.45 : x
  2. Step 2: Convert to fraction form
    15,493.01/21,379.89 = 8,419.45/x
  3. Step 3: Cross multiply
    15,493.01x = 21,379.89 × 8,419.45
  4. Step 4: Simplify right side
    15,493.01x = 180,006,892.98
  5. Step 5: Solve for x
    x = 180,006,892.98/15,493.01
  6. Step 6: Final answer
    x = 11,618.59

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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.