Home / 13,905.60-20,858.40-5,138.70

Finding the Fourth Proportional to 13,905.60, 20,858.40 and 5,138.70

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Solution

The fourth proportional to 13,905.60, 20,858.40 and 5,138.70 is: 7,708.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,905.60 : 20,858.40 = 5,138.70 : x
  2. Step 2: Convert to fraction form
    13,905.60/20,858.40 = 5,138.70/x
  3. Step 3: Cross multiply
    13,905.60x = 20,858.40 × 5,138.70
  4. Step 4: Simplify right side
    13,905.60x = 107,185,060.08
  5. Step 5: Solve for x
    x = 107,185,060.08/13,905.60
  6. Step 6: Final answer
    x = 7,708.05

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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.