Home / 5,390.19-7,439.37-3,121.20

Finding the Fourth Proportional to 5,390.19, 7,439.37 and 3,121.20

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Solution

The fourth proportional to 5,390.19, 7,439.37 and 3,121.20 is: 4,307.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390.19 : 7,439.37 = 3,121.20 : x
  2. Step 2: Convert to fraction form
    5,390.19/7,439.37 = 3,121.20/x
  3. Step 3: Cross multiply
    5,390.19x = 7,439.37 × 3,121.20
  4. Step 4: Simplify right side
    5,390.19x = 23,219,761.64
  5. Step 5: Solve for x
    x = 23,219,761.64/5,390.19
  6. Step 6: Final answer
    x = 4,307.78

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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.