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Finding the Fourth Proportional to 1,008.78, 1,392.21 and 566.84

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Solution

The fourth proportional to 1,008.78, 1,392.21 and 566.84 is: 782.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.78 : 1,392.21 = 566.84 : x
  2. Step 2: Convert to fraction form
    1,008.78/1,392.21 = 566.84/x
  3. Step 3: Cross multiply
    1,008.78x = 1,392.21 × 566.84
  4. Step 4: Simplify right side
    1,008.78x = 789,153.36
  5. Step 5: Solve for x
    x = 789,153.36/1,008.78
  6. Step 6: Final answer
    x = 782.28

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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.