Home / 20,992.81-31,484.52-12,661.35

Finding the Fourth Proportional to 20,992.81, 31,484.52 and 12,661.35

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Solution

The fourth proportional to 20,992.81, 31,484.52 and 12,661.35 is: 18,989.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.81 : 31,484.52 = 12,661.35 : x
  2. Step 2: Convert to fraction form
    20,992.81/31,484.52 = 12,661.35/x
  3. Step 3: Cross multiply
    20,992.81x = 31,484.52 × 12,661.35
  4. Step 4: Simplify right side
    20,992.81x = 398,636,464.00
  5. Step 5: Solve for x
    x = 398,636,464.00/20,992.81
  6. Step 6: Final answer
    x = 18,989.19

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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.