Home / 31,456.79-47,231.64-20,991.99

Finding the Fourth Proportional to 31,456.79, 47,231.64 and 20,991.99

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Solution

The fourth proportional to 31,456.79, 47,231.64 and 20,991.99 is: 31,518.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,456.79 : 47,231.64 = 20,991.99 : x
  2. Step 2: Convert to fraction form
    31,456.79/47,231.64 = 20,991.99/x
  3. Step 3: Cross multiply
    31,456.79x = 47,231.64 × 20,991.99
  4. Step 4: Simplify right side
    31,456.79x = 991,486,114.56
  5. Step 5: Solve for x
    x = 991,486,114.56/31,456.79
  6. Step 6: Final answer
    x = 31,518.99

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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.