Home / 21,136-31,721.20-10,750.72

Finding the Fourth Proportional to 21,136, 31,721.20 and 10,750.72

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Solution

The fourth proportional to 21,136, 31,721.20 and 10,750.72 is: 16,134.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136 : 31,721.20 = 10,750.72 : x
  2. Step 2: Convert to fraction form
    21,136/31,721.20 = 10,750.72/x
  3. Step 3: Cross multiply
    21,136x = 31,721.20 × 10,750.72
  4. Step 4: Simplify right side
    21,136x = 341,025,739.26
  5. Step 5: Solve for x
    x = 341,025,739.26/21,136
  6. Step 6: Final answer
    x = 16,134.83

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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.