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Finding the Fourth Proportional to 720.88, 1,080.24 and 412.56

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Solution

The fourth proportional to 720.88, 1,080.24 and 412.56 is: 618.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.88 : 1,080.24 = 412.56 : x
  2. Step 2: Convert to fraction form
    720.88/1,080.24 = 412.56/x
  3. Step 3: Cross multiply
    720.88x = 1,080.24 × 412.56
  4. Step 4: Simplify right side
    720.88x = 445,663.81
  5. Step 5: Solve for x
    x = 445,663.81/720.88
  6. Step 6: Final answer
    x = 618.22

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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.