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Finding the Fourth Proportional to 720.27, 1,080.90 and 287.46

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Solution

The fourth proportional to 720.27, 1,080.90 and 287.46 is: 431.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.27 : 1,080.90 = 287.46 : x
  2. Step 2: Convert to fraction form
    720.27/1,080.90 = 287.46/x
  3. Step 3: Cross multiply
    720.27x = 1,080.90 × 287.46
  4. Step 4: Simplify right side
    720.27x = 310,715.51
  5. Step 5: Solve for x
    x = 310,715.51/720.27
  6. Step 6: Final answer
    x = 431.39

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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.