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Finding the Fourth Proportional to 778.46, 1,074.51 and 621.36

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Solution

The fourth proportional to 778.46, 1,074.51 and 621.36 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.46 : 1,074.51 = 621.36 : x
  2. Step 2: Convert to fraction form
    778.46/1,074.51 = 621.36/x
  3. Step 3: Cross multiply
    778.46x = 1,074.51 × 621.36
  4. Step 4: Simplify right side
    778.46x = 667,657.53
  5. Step 5: Solve for x
    x = 667,657.53/778.46
  6. Step 6: Final answer
    x = 857.67

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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.