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Finding the Fourth Proportional to 720.51, 1,080.60 and 330.27

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Solution

The fourth proportional to 720.51, 1,080.60 and 330.27 is: 495.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.51 : 1,080.60 = 330.27 : x
  2. Step 2: Convert to fraction form
    720.51/1,080.60 = 330.27/x
  3. Step 3: Cross multiply
    720.51x = 1,080.60 × 330.27
  4. Step 4: Simplify right side
    720.51x = 356,889.14
  5. Step 5: Solve for x
    x = 356,889.14/720.51
  6. Step 6: Final answer
    x = 495.33

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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.