Home / 3,478.56-5,220.60-1,289.40

Finding the Fourth Proportional to 3,478.56, 5,220.60 and 1,289.40

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Solution

The fourth proportional to 3,478.56, 5,220.60 and 1,289.40 is: 1,935.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478.56 : 5,220.60 = 1,289.40 : x
  2. Step 2: Convert to fraction form
    3,478.56/5,220.60 = 1,289.40/x
  3. Step 3: Cross multiply
    3,478.56x = 5,220.60 × 1,289.40
  4. Step 4: Simplify right side
    3,478.56x = 6,731,441.64
  5. Step 5: Solve for x
    x = 6,731,441.64/3,478.56
  6. Step 6: Final answer
    x = 1,935.12

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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.