Home / 1,288.60-1,933.20-422.92

Finding the Fourth Proportional to 1,288.60, 1,933.20 and 422.92

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Solution

The fourth proportional to 1,288.60, 1,933.20 and 422.92 is: 634.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.60 : 1,933.20 = 422.92 : x
  2. Step 2: Convert to fraction form
    1,288.60/1,933.20 = 422.92/x
  3. Step 3: Cross multiply
    1,288.60x = 1,933.20 × 422.92
  4. Step 4: Simplify right side
    1,288.60x = 817,588.94
  5. Step 5: Solve for x
    x = 817,588.94/1,288.60
  6. Step 6: Final answer
    x = 634.48

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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.