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Finding the Fourth Proportional to 779.88, 1,169.16 and 389.64

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Solution

The fourth proportional to 779.88, 1,169.16 and 389.64 is: 584.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.88 : 1,169.16 = 389.64 : x
  2. Step 2: Convert to fraction form
    779.88/1,169.16 = 389.64/x
  3. Step 3: Cross multiply
    779.88x = 1,169.16 × 389.64
  4. Step 4: Simplify right side
    779.88x = 455,551.50
  5. Step 5: Solve for x
    x = 455,551.50/779.88
  6. Step 6: Final answer
    x = 584.13

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Double scale
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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.