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Finding the Fourth Proportional to 779.67, 1,169.61 and 259.83

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Solution

The fourth proportional to 779.67, 1,169.61 and 259.83 is: 389.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.67 : 1,169.61 = 259.83 : x
  2. Step 2: Convert to fraction form
    779.67/1,169.61 = 259.83/x
  3. Step 3: Cross multiply
    779.67x = 1,169.61 × 259.83
  4. Step 4: Simplify right side
    779.67x = 303,899.77
  5. Step 5: Solve for x
    x = 303,899.77/779.67
  6. Step 6: Final answer
    x = 389.78

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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.