Home / 20,999.28-31,477.32-9,318

Finding the Fourth Proportional to 20,999.28, 31,477.32 and 9,318

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Solution

The fourth proportional to 20,999.28, 31,477.32 and 9,318 is: 13,967.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.28 : 31,477.32 = 9,318 : x
  2. Step 2: Convert to fraction form
    20,999.28/31,477.32 = 9,318/x
  3. Step 3: Cross multiply
    20,999.28x = 31,477.32 × 9,318
  4. Step 4: Simplify right side
    20,999.28x = 293,305,667.76
  5. Step 5: Solve for x
    x = 293,305,667.76/20,999.28
  6. Step 6: Final answer
    x = 13,967.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.