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Finding the Fourth Proportional to 1,369.83, 2,054.93 and 720.60

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Solution

The fourth proportional to 1,369.83, 2,054.93 and 720.60 is: 1,080.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.83 : 2,054.93 = 720.60 : x
  2. Step 2: Convert to fraction form
    1,369.83/2,054.93 = 720.60/x
  3. Step 3: Cross multiply
    1,369.83x = 2,054.93 × 720.60
  4. Step 4: Simplify right side
    1,369.83x = 1,480,778.96
  5. Step 5: Solve for x
    x = 1,480,778.96/1,369.83
  6. Step 6: Final answer
    x = 1,080.99

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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.