Home / 21,135.78-31,715.33-11,781.06

Finding the Fourth Proportional to 21,135.78, 31,715.33 and 11,781.06

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Solution

The fourth proportional to 21,135.78, 31,715.33 and 11,781.06 is: 17,678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.78 : 31,715.33 = 11,781.06 : x
  2. Step 2: Convert to fraction form
    21,135.78/31,715.33 = 11,781.06/x
  3. Step 3: Cross multiply
    21,135.78x = 31,715.33 × 11,781.06
  4. Step 4: Simplify right side
    21,135.78x = 373,640,235.10
  5. Step 5: Solve for x
    x = 373,640,235.10/21,135.78
  6. Step 6: Final answer
    x = 17,678.09

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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.