Home / 21,921.81-30,228.30-13,953.84

Finding the Fourth Proportional to 21,921.81, 30,228.30 and 13,953.84

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Solution

The fourth proportional to 21,921.81, 30,228.30 and 13,953.84 is: 19,241.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,921.81 : 30,228.30 = 13,953.84 : x
  2. Step 2: Convert to fraction form
    21,921.81/30,228.30 = 13,953.84/x
  3. Step 3: Cross multiply
    21,921.81x = 30,228.30 × 13,953.84
  4. Step 4: Simplify right side
    21,921.81x = 421,800,861.67
  5. Step 5: Solve for x
    x = 421,800,861.67/21,921.81
  6. Step 6: Final answer
    x = 19,241.15

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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.