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Finding the Fourth Proportional to 984.42, 1,358.94 and 635.28

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Solution

The fourth proportional to 984.42, 1,358.94 and 635.28 is: 876.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.42 : 1,358.94 = 635.28 : x
  2. Step 2: Convert to fraction form
    984.42/1,358.94 = 635.28/x
  3. Step 3: Cross multiply
    984.42x = 1,358.94 × 635.28
  4. Step 4: Simplify right side
    984.42x = 863,307.40
  5. Step 5: Solve for x
    x = 863,307.40/984.42
  6. Step 6: Final answer
    x = 876.97

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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.