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Finding the Fourth Proportional to 984.62, 1,476.91 and 399.47

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Solution

The fourth proportional to 984.62, 1,476.91 and 399.47 is: 599.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.62 : 1,476.91 = 399.47 : x
  2. Step 2: Convert to fraction form
    984.62/1,476.91 = 399.47/x
  3. Step 3: Cross multiply
    984.62x = 1,476.91 × 399.47
  4. Step 4: Simplify right side
    984.62x = 589,971.86
  5. Step 5: Solve for x
    x = 589,971.86/984.62
  6. Step 6: Final answer
    x = 599.19

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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.