Home / 3,215-4,821.78-1,570.76

Finding the Fourth Proportional to 3,215, 4,821.78 and 1,570.76

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Solution

The fourth proportional to 3,215, 4,821.78 and 1,570.76 is: 2,355.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,215 : 4,821.78 = 1,570.76 : x
  2. Step 2: Convert to fraction form
    3,215/4,821.78 = 1,570.76/x
  3. Step 3: Cross multiply
    3,215x = 4,821.78 × 1,570.76
  4. Step 4: Simplify right side
    3,215x = 7,573,859.15
  5. Step 5: Solve for x
    x = 7,573,859.15/3,215
  6. Step 6: Final answer
    x = 2,355.79

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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.