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Finding the Fourth Proportional to 984.12, 1,356.42 and 688.86

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Solution

The fourth proportional to 984.12, 1,356.42 and 688.86 is: 949.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.12 : 1,356.42 = 688.86 : x
  2. Step 2: Convert to fraction form
    984.12/1,356.42 = 688.86/x
  3. Step 3: Cross multiply
    984.12x = 1,356.42 × 688.86
  4. Step 4: Simplify right side
    984.12x = 934,383.48
  5. Step 5: Solve for x
    x = 934,383.48/984.12
  6. Step 6: Final answer
    x = 949.46

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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.