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Finding the Fourth Proportional to 984.70, 1,358.94 and 559.36

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Solution

The fourth proportional to 984.70, 1,358.94 and 559.36 is: 771.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.70 : 1,358.94 = 559.36 : x
  2. Step 2: Convert to fraction form
    984.70/1,358.94 = 559.36/x
  3. Step 3: Cross multiply
    984.70x = 1,358.94 × 559.36
  4. Step 4: Simplify right side
    984.70x = 760,133.88
  5. Step 5: Solve for x
    x = 760,133.88/984.70
  6. Step 6: Final answer
    x = 771.94

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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.