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Finding the Fourth Proportional to 1,028.98, 1,419.99 and 556.87

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Solution

The fourth proportional to 1,028.98, 1,419.99 and 556.87 is: 768.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.98 : 1,419.99 = 556.87 : x
  2. Step 2: Convert to fraction form
    1,028.98/1,419.99 = 556.87/x
  3. Step 3: Cross multiply
    1,028.98x = 1,419.99 × 556.87
  4. Step 4: Simplify right side
    1,028.98x = 790,747.38
  5. Step 5: Solve for x
    x = 790,747.38/1,028.98
  6. Step 6: Final answer
    x = 768.47

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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.