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Finding the Fourth Proportional to 1,118.79, 1,679 and 571.43

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Solution

The fourth proportional to 1,118.79, 1,679 and 571.43 is: 857.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.79 : 1,679 = 571.43 : x
  2. Step 2: Convert to fraction form
    1,118.79/1,679 = 571.43/x
  3. Step 3: Cross multiply
    1,118.79x = 1,679 × 571.43
  4. Step 4: Simplify right side
    1,118.79x = 959,430.97
  5. Step 5: Solve for x
    x = 959,430.97/1,118.79
  6. Step 6: Final answer
    x = 857.56

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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.