Home / 21,311.78-29,409.18-11,878.52

Finding the Fourth Proportional to 21,311.78, 29,409.18 and 11,878.52

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Solution

The fourth proportional to 21,311.78, 29,409.18 and 11,878.52 is: 16,391.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311.78 : 29,409.18 = 11,878.52 : x
  2. Step 2: Convert to fraction form
    21,311.78/29,409.18 = 11,878.52/x
  3. Step 3: Cross multiply
    21,311.78x = 29,409.18 × 11,878.52
  4. Step 4: Simplify right side
    21,311.78x = 349,337,532.81
  5. Step 5: Solve for x
    x = 349,337,532.81/21,311.78
  6. Step 6: Final answer
    x = 16,391.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.