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Finding the Fourth Proportional to 720.39, 993.76 and 484.39

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Solution

The fourth proportional to 720.39, 993.76 and 484.39 is: 668.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.39 : 993.76 = 484.39 : x
  2. Step 2: Convert to fraction form
    720.39/993.76 = 484.39/x
  3. Step 3: Cross multiply
    720.39x = 993.76 × 484.39
  4. Step 4: Simplify right side
    720.39x = 481,367.41
  5. Step 5: Solve for x
    x = 481,367.41/720.39
  6. Step 6: Final answer
    x = 668.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.