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Finding the Fourth Proportional to 1,107.72, 1,661.76 and 621.72

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Solution

The fourth proportional to 1,107.72, 1,661.76 and 621.72 is: 932.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.72 : 1,661.76 = 621.72 : x
  2. Step 2: Convert to fraction form
    1,107.72/1,661.76 = 621.72/x
  3. Step 3: Cross multiply
    1,107.72x = 1,661.76 × 621.72
  4. Step 4: Simplify right side
    1,107.72x = 1,033,149.43
  5. Step 5: Solve for x
    x = 1,033,149.43/1,107.72
  6. Step 6: Final answer
    x = 932.68

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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.