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Finding the Fourth Proportional to 984.18, 1,356.21 and 921

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Solution

The fourth proportional to 984.18, 1,356.21 and 921 is: 1,269.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.18 : 1,356.21 = 921 : x
  2. Step 2: Convert to fraction form
    984.18/1,356.21 = 921/x
  3. Step 3: Cross multiply
    984.18x = 1,356.21 × 921
  4. Step 4: Simplify right side
    984.18x = 1,249,069.41
  5. Step 5: Solve for x
    x = 1,249,069.41/984.18
  6. Step 6: Final answer
    x = 1,269.15

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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.