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Finding the Fourth Proportional to 1,028.85, 1,419.78 and 586.86

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Solution

The fourth proportional to 1,028.85, 1,419.78 and 586.86 is: 809.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.85 : 1,419.78 = 586.86 : x
  2. Step 2: Convert to fraction form
    1,028.85/1,419.78 = 586.86/x
  3. Step 3: Cross multiply
    1,028.85x = 1,419.78 × 586.86
  4. Step 4: Simplify right side
    1,028.85x = 833,212.09
  5. Step 5: Solve for x
    x = 833,212.09/1,028.85
  6. Step 6: Final answer
    x = 809.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.