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Finding the Fourth Proportional to 55,980.43, 83,992.53 and 20,911.90

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Solution

The fourth proportional to 55,980.43, 83,992.53 and 20,911.90 is: 31,376.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,980.43 : 83,992.53 = 20,911.90 : x
  2. Step 2: Convert to fraction form
    55,980.43/83,992.53 = 20,911.90/x
  3. Step 3: Cross multiply
    55,980.43x = 83,992.53 × 20,911.90
  4. Step 4: Simplify right side
    55,980.43x = 1,756,443,388.11
  5. Step 5: Solve for x
    x = 1,756,443,388.11/55,980.43
  6. Step 6: Final answer
    x = 31,376.03

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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.