Home / 20,390.40-28,131.30-13,327.20

Finding the Fourth Proportional to 20,390.40, 28,131.30 and 13,327.20

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Solution

The fourth proportional to 20,390.40, 28,131.30 and 13,327.20 is: 18,386.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.40 : 28,131.30 = 13,327.20 : x
  2. Step 2: Convert to fraction form
    20,390.40/28,131.30 = 13,327.20/x
  3. Step 3: Cross multiply
    20,390.40x = 28,131.30 × 13,327.20
  4. Step 4: Simplify right side
    20,390.40x = 374,911,461.36
  5. Step 5: Solve for x
    x = 374,911,461.36/20,390.40
  6. Step 6: Final answer
    x = 18,386.67

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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.