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Finding the Fourth Proportional to 720.42, 1,080.53 and 411.27

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Solution

The fourth proportional to 720.42, 1,080.53 and 411.27 is: 616.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.42 : 1,080.53 = 411.27 : x
  2. Step 2: Convert to fraction form
    720.42/1,080.53 = 411.27/x
  3. Step 3: Cross multiply
    720.42x = 1,080.53 × 411.27
  4. Step 4: Simplify right side
    720.42x = 444,384.82
  5. Step 5: Solve for x
    x = 444,384.82/720.42
  6. Step 6: Final answer
    x = 616.84

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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.