Home / 20,440.31-28,217.21-13,730.67

Finding the Fourth Proportional to 20,440.31, 28,217.21 and 13,730.67

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Solution

The fourth proportional to 20,440.31, 28,217.21 and 13,730.67 is: 18,954.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,440.31 : 28,217.21 = 13,730.67 : x
  2. Step 2: Convert to fraction form
    20,440.31/28,217.21 = 13,730.67/x
  3. Step 3: Cross multiply
    20,440.31x = 28,217.21 × 13,730.67
  4. Step 4: Simplify right side
    20,440.31x = 387,441,130.18
  5. Step 5: Solve for x
    x = 387,441,130.18/20,440.31
  6. Step 6: Final answer
    x = 18,954.76

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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.