Home / 20,782.60-31,136.10-11,991.40

Finding the Fourth Proportional to 20,782.60, 31,136.10 and 11,991.40

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Solution

The fourth proportional to 20,782.60, 31,136.10 and 11,991.40 is: 17,965.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.60 : 31,136.10 = 11,991.40 : x
  2. Step 2: Convert to fraction form
    20,782.60/31,136.10 = 11,991.40/x
  3. Step 3: Cross multiply
    20,782.60x = 31,136.10 × 11,991.40
  4. Step 4: Simplify right side
    20,782.60x = 373,365,429.54
  5. Step 5: Solve for x
    x = 373,365,429.54/20,782.60
  6. Step 6: Final answer
    x = 17,965.29

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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.