Home / 21,138.54-29,170.88-11,578.32

Finding the Fourth Proportional to 21,138.54, 29,170.88 and 11,578.32

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Solution

The fourth proportional to 21,138.54, 29,170.88 and 11,578.32 is: 15,977.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.54 : 29,170.88 = 11,578.32 : x
  2. Step 2: Convert to fraction form
    21,138.54/29,170.88 = 11,578.32/x
  3. Step 3: Cross multiply
    21,138.54x = 29,170.88 × 11,578.32
  4. Step 4: Simplify right side
    21,138.54x = 337,749,783.32
  5. Step 5: Solve for x
    x = 337,749,783.32/21,138.54
  6. Step 6: Final answer
    x = 15,977.91

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1.5x scale

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.