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Finding the Fourth Proportional to 1,485, 2,223.72 and 1,021.68

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Solution

The fourth proportional to 1,485, 2,223.72 and 1,021.68 is: 1,529.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485 : 2,223.72 = 1,021.68 : x
  2. Step 2: Convert to fraction form
    1,485/2,223.72 = 1,021.68/x
  3. Step 3: Cross multiply
    1,485x = 2,223.72 × 1,021.68
  4. Step 4: Simplify right side
    1,485x = 2,271,930.25
  5. Step 5: Solve for x
    x = 2,271,930.25/1,485
  6. Step 6: Final answer
    x = 1,529.92

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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.