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Finding the Fourth Proportional to 1,281.92, 1,921.55 and 622.82

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Solution

The fourth proportional to 1,281.92, 1,921.55 and 622.82 is: 933.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.92 : 1,921.55 = 622.82 : x
  2. Step 2: Convert to fraction form
    1,281.92/1,921.55 = 622.82/x
  3. Step 3: Cross multiply
    1,281.92x = 1,921.55 × 622.82
  4. Step 4: Simplify right side
    1,281.92x = 1,196,786.13
  5. Step 5: Solve for x
    x = 1,196,786.13/1,281.92
  6. Step 6: Final answer
    x = 933.59

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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.