Home / 21,989.27-30,343.38-12,913.67

Finding the Fourth Proportional to 21,989.27, 30,343.38 and 12,913.67

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Solution

The fourth proportional to 21,989.27, 30,343.38 and 12,913.67 is: 17,819.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.27 : 30,343.38 = 12,913.67 : x
  2. Step 2: Convert to fraction form
    21,989.27/30,343.38 = 12,913.67/x
  3. Step 3: Cross multiply
    21,989.27x = 30,343.38 × 12,913.67
  4. Step 4: Simplify right side
    21,989.27x = 391,844,396.00
  5. Step 5: Solve for x
    x = 391,844,396.00/21,989.27
  6. Step 6: Final answer
    x = 17,819.80

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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.