Home / 20,772.70-31,123.60-11,420.55

Finding the Fourth Proportional to 20,772.70, 31,123.60 and 11,420.55

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Solution

The fourth proportional to 20,772.70, 31,123.60 and 11,420.55 is: 17,111.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.70 : 31,123.60 = 11,420.55 : x
  2. Step 2: Convert to fraction form
    20,772.70/31,123.60 = 11,420.55/x
  3. Step 3: Cross multiply
    20,772.70x = 31,123.60 × 11,420.55
  4. Step 4: Simplify right side
    20,772.70x = 355,448,601.43
  5. Step 5: Solve for x
    x = 355,448,601.43/20,772.70
  6. Step 6: Final answer
    x = 17,111.33

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1.5x scale

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.