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Finding the Fourth Proportional to 1,422.90, 2,134.33 and 556.61

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Solution

The fourth proportional to 1,422.90, 2,134.33 and 556.61 is: 834.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.90 : 2,134.33 = 556.61 : x
  2. Step 2: Convert to fraction form
    1,422.90/2,134.33 = 556.61/x
  3. Step 3: Cross multiply
    1,422.90x = 2,134.33 × 556.61
  4. Step 4: Simplify right side
    1,422.90x = 1,187,977.36
  5. Step 5: Solve for x
    x = 1,187,977.36/1,422.90
  6. Step 6: Final answer
    x = 834.90

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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.