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Finding the Fourth Proportional to 1,109.40, 1,664.10 and 984.60

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Solution

The fourth proportional to 1,109.40, 1,664.10 and 984.60 is: 1,476.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.40 : 1,664.10 = 984.60 : x
  2. Step 2: Convert to fraction form
    1,109.40/1,664.10 = 984.60/x
  3. Step 3: Cross multiply
    1,109.40x = 1,664.10 × 984.60
  4. Step 4: Simplify right side
    1,109.40x = 1,638,472.86
  5. Step 5: Solve for x
    x = 1,638,472.86/1,109.40
  6. Step 6: Final answer
    x = 1,476.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.