Home / 13,427.40-20,138.70-8,488.20

Finding the Fourth Proportional to 13,427.40, 20,138.70 and 8,488.20

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Solution

The fourth proportional to 13,427.40, 20,138.70 and 8,488.20 is: 12,730.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,427.40 : 20,138.70 = 8,488.20 : x
  2. Step 2: Convert to fraction form
    13,427.40/20,138.70 = 8,488.20/x
  3. Step 3: Cross multiply
    13,427.40x = 20,138.70 × 8,488.20
  4. Step 4: Simplify right side
    13,427.40x = 170,941,313.34
  5. Step 5: Solve for x
    x = 170,941,313.34/13,427.40
  6. Step 6: Final answer
    x = 12,730.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.