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Finding the Fourth Proportional to 1,205.50, 1,664 and 739.75

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Solution

The fourth proportional to 1,205.50, 1,664 and 739.75 is: 1,021.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.50 : 1,664 = 739.75 : x
  2. Step 2: Convert to fraction form
    1,205.50/1,664 = 739.75/x
  3. Step 3: Cross multiply
    1,205.50x = 1,664 × 739.75
  4. Step 4: Simplify right side
    1,205.50x = 1,230,944
  5. Step 5: Solve for x
    x = 1,230,944/1,205.50
  6. Step 6: Final answer
    x = 1,021.11

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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.