Home / 5,378.20-7,421.70-3,140.20

Finding the Fourth Proportional to 5,378.20, 7,421.70 and 3,140.20

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Solution

The fourth proportional to 5,378.20, 7,421.70 and 3,140.20 is: 4,333.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,378.20 : 7,421.70 = 3,140.20 : x
  2. Step 2: Convert to fraction form
    5,378.20/7,421.70 = 3,140.20/x
  3. Step 3: Cross multiply
    5,378.20x = 7,421.70 × 3,140.20
  4. Step 4: Simplify right side
    5,378.20x = 23,305,622.34
  5. Step 5: Solve for x
    x = 23,305,622.34/5,378.20
  6. Step 6: Final answer
    x = 4,333.35

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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.