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Finding the Fourth Proportional to 720.03, 1,080.50 and 412.03

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Solution

The fourth proportional to 720.03, 1,080.50 and 412.03 is: 618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.03 : 1,080.50 = 412.03 : x
  2. Step 2: Convert to fraction form
    720.03/1,080.50 = 412.03/x
  3. Step 3: Cross multiply
    720.03x = 1,080.50 × 412.03
  4. Step 4: Simplify right side
    720.03x = 445,196.74
  5. Step 5: Solve for x
    x = 445,196.74/720.03
  6. Step 6: Final answer
    x = 618.30

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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.