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Finding the Fourth Proportional to 1,028.89, 1,420.13 and 635.69

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Solution

The fourth proportional to 1,028.89, 1,420.13 and 635.69 is: 877.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.89 : 1,420.13 = 635.69 : x
  2. Step 2: Convert to fraction form
    1,028.89/1,420.13 = 635.69/x
  3. Step 3: Cross multiply
    1,028.89x = 1,420.13 × 635.69
  4. Step 4: Simplify right side
    1,028.89x = 902,752.16
  5. Step 5: Solve for x
    x = 902,752.16/1,028.89
  6. Step 6: Final answer
    x = 877.41

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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.