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Finding the Fourth Proportional to 722.55, 1,080.45 and 621.03

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Solution

The fourth proportional to 722.55, 1,080.45 and 621.03 is: 928.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.55 : 1,080.45 = 621.03 : x
  2. Step 2: Convert to fraction form
    722.55/1,080.45 = 621.03/x
  3. Step 3: Cross multiply
    722.55x = 1,080.45 × 621.03
  4. Step 4: Simplify right side
    722.55x = 670,991.86
  5. Step 5: Solve for x
    x = 670,991.86/722.55
  6. Step 6: Final answer
    x = 928.64

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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.