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Finding the Fourth Proportional to 984.92, 1,356.40 and 981.88

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Solution

The fourth proportional to 984.92, 1,356.40 and 981.88 is: 1,352.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.92 : 1,356.40 = 981.88 : x
  2. Step 2: Convert to fraction form
    984.92/1,356.40 = 981.88/x
  3. Step 3: Cross multiply
    984.92x = 1,356.40 × 981.88
  4. Step 4: Simplify right side
    984.92x = 1,331,822.03
  5. Step 5: Solve for x
    x = 1,331,822.03/984.92
  6. Step 6: Final answer
    x = 1,352.21

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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.