Home / 20,918.96-31,346.04-12,158

Finding the Fourth Proportional to 20,918.96, 31,346.04 and 12,158

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Solution

The fourth proportional to 20,918.96, 31,346.04 and 12,158 is: 18,218.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.96 : 31,346.04 = 12,158 : x
  2. Step 2: Convert to fraction form
    20,918.96/31,346.04 = 12,158/x
  3. Step 3: Cross multiply
    20,918.96x = 31,346.04 × 12,158
  4. Step 4: Simplify right side
    20,918.96x = 381,105,154.32
  5. Step 5: Solve for x
    x = 381,105,154.32/20,918.96
  6. Step 6: Final answer
    x = 18,218.17

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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.