Home / 21,211.61-29,274.31-13,561.81

Finding the Fourth Proportional to 21,211.61, 29,274.31 and 13,561.81

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Solution

The fourth proportional to 21,211.61, 29,274.31 and 13,561.81 is: 18,716.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,211.61 : 29,274.31 = 13,561.81 : x
  2. Step 2: Convert to fraction form
    21,211.61/29,274.31 = 13,561.81/x
  3. Step 3: Cross multiply
    21,211.61x = 29,274.31 × 13,561.81
  4. Step 4: Simplify right side
    21,211.61x = 397,012,738.54
  5. Step 5: Solve for x
    x = 397,012,738.54/21,211.61
  6. Step 6: Final answer
    x = 18,716.77

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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.