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Finding the Fourth Proportional to 984.88, 1,477.21 and 399.29

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Solution

The fourth proportional to 984.88, 1,477.21 and 399.29 is: 598.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.88 : 1,477.21 = 399.29 : x
  2. Step 2: Convert to fraction form
    984.88/1,477.21 = 399.29/x
  3. Step 3: Cross multiply
    984.88x = 1,477.21 × 399.29
  4. Step 4: Simplify right side
    984.88x = 589,825.80
  5. Step 5: Solve for x
    x = 589,825.80/984.88
  6. Step 6: Final answer
    x = 598.88

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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.