Home / 20,388-28,135.49-11,895.96

Finding the Fourth Proportional to 20,388, 28,135.49 and 11,895.96

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Solution

The fourth proportional to 20,388, 28,135.49 and 11,895.96 is: 16,416.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388 : 28,135.49 = 11,895.96 : x
  2. Step 2: Convert to fraction form
    20,388/28,135.49 = 11,895.96/x
  3. Step 3: Cross multiply
    20,388x = 28,135.49 × 11,895.96
  4. Step 4: Simplify right side
    20,388x = 334,698,663.62
  5. Step 5: Solve for x
    x = 334,698,663.62/20,388
  6. Step 6: Final answer
    x = 16,416.45

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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.