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Finding the Fourth Proportional to 779.64, 1,169.58 and 259.62

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Solution

The fourth proportional to 779.64, 1,169.58 and 259.62 is: 389.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.64 : 1,169.58 = 259.62 : x
  2. Step 2: Convert to fraction form
    779.64/1,169.58 = 259.62/x
  3. Step 3: Cross multiply
    779.64x = 1,169.58 × 259.62
  4. Step 4: Simplify right side
    779.64x = 303,646.36
  5. Step 5: Solve for x
    x = 303,646.36/779.64
  6. Step 6: Final answer
    x = 389.47

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Double scale
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Similar ratio
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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.