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Finding the Fourth Proportional to 720.64, 1,080.10 and 396.20

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Solution

The fourth proportional to 720.64, 1,080.10 and 396.20 is: 593.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.64 : 1,080.10 = 396.20 : x
  2. Step 2: Convert to fraction form
    720.64/1,080.10 = 396.20/x
  3. Step 3: Cross multiply
    720.64x = 1,080.10 × 396.20
  4. Step 4: Simplify right side
    720.64x = 427,935.62
  5. Step 5: Solve for x
    x = 427,935.62/720.64
  6. Step 6: Final answer
    x = 593.83

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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.