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Finding the Fourth Proportional to 720.37, 1,080.42 and 403.89

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Solution

The fourth proportional to 720.37, 1,080.42 and 403.89 is: 605.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.37 : 1,080.42 = 403.89 : x
  2. Step 2: Convert to fraction form
    720.37/1,080.42 = 403.89/x
  3. Step 3: Cross multiply
    720.37x = 1,080.42 × 403.89
  4. Step 4: Simplify right side
    720.37x = 436,370.83
  5. Step 5: Solve for x
    x = 436,370.83/720.37
  6. Step 6: Final answer
    x = 605.76

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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.