Home / 20,792.90-31,144.16-12,897.36

Finding the Fourth Proportional to 20,792.90, 31,144.16 and 12,897.36

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Solution

The fourth proportional to 20,792.90, 31,144.16 and 12,897.36 is: 19,318.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,792.90 : 31,144.16 = 12,897.36 : x
  2. Step 2: Convert to fraction form
    20,792.90/31,144.16 = 12,897.36/x
  3. Step 3: Cross multiply
    20,792.90x = 31,144.16 × 12,897.36
  4. Step 4: Simplify right side
    20,792.90x = 401,677,475.66
  5. Step 5: Solve for x
    x = 401,677,475.66/20,792.90
  6. Step 6: Final answer
    x = 19,318.01

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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.