Home / 21,111.76-29,134.32-11,680.64

Finding the Fourth Proportional to 21,111.76, 29,134.32 and 11,680.64

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Solution

The fourth proportional to 21,111.76, 29,134.32 and 11,680.64 is: 16,119.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.76 : 29,134.32 = 11,680.64 : x
  2. Step 2: Convert to fraction form
    21,111.76/29,134.32 = 11,680.64/x
  3. Step 3: Cross multiply
    21,111.76x = 29,134.32 × 11,680.64
  4. Step 4: Simplify right side
    21,111.76x = 340,307,503.56
  5. Step 5: Solve for x
    x = 340,307,503.56/21,111.76
  6. Step 6: Final answer
    x = 16,119.33

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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.