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Finding the Fourth Proportional to 2,578.37, 3,868.40 and 823.67

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Solution

The fourth proportional to 2,578.37, 3,868.40 and 823.67 is: 1,235.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,578.37 : 3,868.40 = 823.67 : x
  2. Step 2: Convert to fraction form
    2,578.37/3,868.40 = 823.67/x
  3. Step 3: Cross multiply
    2,578.37x = 3,868.40 × 823.67
  4. Step 4: Simplify right side
    2,578.37x = 3,186,267.75
  5. Step 5: Solve for x
    x = 3,186,267.75/2,578.37
  6. Step 6: Final answer
    x = 1,235.77

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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.