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Finding the Fourth Proportional to 1,477.85, 2,216.78 and 786.65

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Solution

The fourth proportional to 1,477.85, 2,216.78 and 786.65 is: 1,179.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,477.85 : 2,216.78 = 786.65 : x
  2. Step 2: Convert to fraction form
    1,477.85/2,216.78 = 786.65/x
  3. Step 3: Cross multiply
    1,477.85x = 2,216.78 × 786.65
  4. Step 4: Simplify right side
    1,477.85x = 1,743,826.05
  5. Step 5: Solve for x
    x = 1,743,826.05/1,477.85
  6. Step 6: Final answer
    x = 1,179.98

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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.