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Finding the Fourth Proportional to 1,028.50, 1,419.36 and 562.78

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Solution

The fourth proportional to 1,028.50, 1,419.36 and 562.78 is: 776.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.50 : 1,419.36 = 562.78 : x
  2. Step 2: Convert to fraction form
    1,028.50/1,419.36 = 562.78/x
  3. Step 3: Cross multiply
    1,028.50x = 1,419.36 × 562.78
  4. Step 4: Simplify right side
    1,028.50x = 798,787.42
  5. Step 5: Solve for x
    x = 798,787.42/1,028.50
  6. Step 6: Final answer
    x = 776.65

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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.