Home / 21,136.99-31,719.32-7,989.37

Finding the Fourth Proportional to 21,136.99, 31,719.32 and 7,989.37

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Solution

The fourth proportional to 21,136.99, 31,719.32 and 7,989.37 is: 11,989.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.99 : 31,719.32 = 7,989.37 : x
  2. Step 2: Convert to fraction form
    21,136.99/31,719.32 = 7,989.37/x
  3. Step 3: Cross multiply
    21,136.99x = 31,719.32 × 7,989.37
  4. Step 4: Simplify right side
    21,136.99x = 253,417,185.08
  5. Step 5: Solve for x
    x = 253,417,185.08/21,136.99
  6. Step 6: Final answer
    x = 11,989.28

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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.