Home / 21,479.36-29,640-11,919.74

Finding the Fourth Proportional to 21,479.36, 29,640 and 11,919.74

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Solution

The fourth proportional to 21,479.36, 29,640 and 11,919.74 is: 16,448.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.36 : 29,640 = 11,919.74 : x
  2. Step 2: Convert to fraction form
    21,479.36/29,640 = 11,919.74/x
  3. Step 3: Cross multiply
    21,479.36x = 29,640 × 11,919.74
  4. Step 4: Simplify right side
    21,479.36x = 353,301,093.60
  5. Step 5: Solve for x
    x = 353,301,093.60/21,479.36
  6. Step 6: Final answer
    x = 16,448.40

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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.