Home / 21,136.78-31,716.84-11,782.06

Finding the Fourth Proportional to 21,136.78, 31,716.84 and 11,782.06

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Solution

The fourth proportional to 21,136.78, 31,716.84 and 11,782.06 is: 17,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.78 : 31,716.84 = 11,782.06 : x
  2. Step 2: Convert to fraction form
    21,136.78/31,716.84 = 11,782.06/x
  3. Step 3: Cross multiply
    21,136.78x = 31,716.84 × 11,782.06
  4. Step 4: Simplify right side
    21,136.78x = 373,689,652.98
  5. Step 5: Solve for x
    x = 373,689,652.98/21,136.78
  6. Step 6: Final answer
    x = 17,679.60

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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.