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Finding the Fourth Proportional to 1,028.40, 1,418.08 and 674.62

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Solution

The fourth proportional to 1,028.40, 1,418.08 and 674.62 is: 930.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.40 : 1,418.08 = 674.62 : x
  2. Step 2: Convert to fraction form
    1,028.40/1,418.08 = 674.62/x
  3. Step 3: Cross multiply
    1,028.40x = 1,418.08 × 674.62
  4. Step 4: Simplify right side
    1,028.40x = 956,665.13
  5. Step 5: Solve for x
    x = 956,665.13/1,028.40
  6. Step 6: Final answer
    x = 930.25

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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.