Home / 13,435.40-20,138.70-5,112.20

Finding the Fourth Proportional to 13,435.40, 20,138.70 and 5,112.20

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Solution

The fourth proportional to 13,435.40, 20,138.70 and 5,112.20 is: 7,662.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,435.40 : 20,138.70 = 5,112.20 : x
  2. Step 2: Convert to fraction form
    13,435.40/20,138.70 = 5,112.20/x
  3. Step 3: Cross multiply
    13,435.40x = 20,138.70 × 5,112.20
  4. Step 4: Simplify right side
    13,435.40x = 102,953,062.14
  5. Step 5: Solve for x
    x = 102,953,062.14/13,435.40
  6. Step 6: Final answer
    x = 7,662.82

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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.