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Finding the Fourth Proportional to 1,485.81, 2,228.68 and 445.81

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Solution

The fourth proportional to 1,485.81, 2,228.68 and 445.81 is: 668.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.81 : 2,228.68 = 445.81 : x
  2. Step 2: Convert to fraction form
    1,485.81/2,228.68 = 445.81/x
  3. Step 3: Cross multiply
    1,485.81x = 2,228.68 × 445.81
  4. Step 4: Simplify right side
    1,485.81x = 993,567.83
  5. Step 5: Solve for x
    x = 993,567.83/1,485.81
  6. Step 6: Final answer
    x = 668.70

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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.