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Finding the Fourth Proportional to 869.36, 1,304 and 679.28

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Solution

The fourth proportional to 869.36, 1,304 and 679.28 is: 1,018.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.36 : 1,304 = 679.28 : x
  2. Step 2: Convert to fraction form
    869.36/1,304 = 679.28/x
  3. Step 3: Cross multiply
    869.36x = 1,304 × 679.28
  4. Step 4: Simplify right side
    869.36x = 885,781.12
  5. Step 5: Solve for x
    x = 885,781.12/869.36
  6. Step 6: Final answer
    x = 1,018.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.