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Finding the Fourth Proportional to 1,205.48, 1,664.33 and 984.95

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Solution

The fourth proportional to 1,205.48, 1,664.33 and 984.95 is: 1,359.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.48 : 1,664.33 = 984.95 : x
  2. Step 2: Convert to fraction form
    1,205.48/1,664.33 = 984.95/x
  3. Step 3: Cross multiply
    1,205.48x = 1,664.33 × 984.95
  4. Step 4: Simplify right side
    1,205.48x = 1,639,276.91
  5. Step 5: Solve for x
    x = 1,639,276.91/1,205.48
  6. Step 6: Final answer
    x = 1,359.85

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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.