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Finding the Fourth Proportional to 1,028.79, 1,419.68 and 635.13

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Solution

The fourth proportional to 1,028.79, 1,419.68 and 635.13 is: 876.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.79 : 1,419.68 = 635.13 : x
  2. Step 2: Convert to fraction form
    1,028.79/1,419.68 = 635.13/x
  3. Step 3: Cross multiply
    1,028.79x = 1,419.68 × 635.13
  4. Step 4: Simplify right side
    1,028.79x = 901,678.18
  5. Step 5: Solve for x
    x = 901,678.18/1,028.79
  6. Step 6: Final answer
    x = 876.45

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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.