Home / 2,586.18-3,879.20-638.40

Finding the Fourth Proportional to 2,586.18, 3,879.20 and 638.40

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Solution

The fourth proportional to 2,586.18, 3,879.20 and 638.40 is: 957.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,586.18 : 3,879.20 = 638.40 : x
  2. Step 2: Convert to fraction form
    2,586.18/3,879.20 = 638.40/x
  3. Step 3: Cross multiply
    2,586.18x = 3,879.20 × 638.40
  4. Step 4: Simplify right side
    2,586.18x = 2,476,481.28
  5. Step 5: Solve for x
    x = 2,476,481.28/2,586.18
  6. Step 6: Final answer
    x = 957.58

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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.