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Finding the Fourth Proportional to 984.16, 1,358.78 and 611.68

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Solution

The fourth proportional to 984.16, 1,358.78 and 611.68 is: 844.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.16 : 1,358.78 = 611.68 : x
  2. Step 2: Convert to fraction form
    984.16/1,358.78 = 611.68/x
  3. Step 3: Cross multiply
    984.16x = 1,358.78 × 611.68
  4. Step 4: Simplify right side
    984.16x = 831,134.64
  5. Step 5: Solve for x
    x = 831,134.64/984.16
  6. Step 6: Final answer
    x = 844.51

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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.