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Finding the Fourth Proportional to 984.50, 1,359.28 and 611.63

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Solution

The fourth proportional to 984.50, 1,359.28 and 611.63 is: 844.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.50 : 1,359.28 = 611.63 : x
  2. Step 2: Convert to fraction form
    984.50/1,359.28 = 611.63/x
  3. Step 3: Cross multiply
    984.50x = 1,359.28 × 611.63
  4. Step 4: Simplify right side
    984.50x = 831,376.43
  5. Step 5: Solve for x
    x = 831,376.43/984.50
  6. Step 6: Final answer
    x = 844.47

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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.