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Finding the Fourth Proportional to 1,392.75, 2,089.89 and 571.60

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Solution

The fourth proportional to 1,392.75, 2,089.89 and 571.60 is: 857.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.75 : 2,089.89 = 571.60 : x
  2. Step 2: Convert to fraction form
    1,392.75/2,089.89 = 571.60/x
  3. Step 3: Cross multiply
    1,392.75x = 2,089.89 × 571.60
  4. Step 4: Simplify right side
    1,392.75x = 1,194,581.12
  5. Step 5: Solve for x
    x = 1,194,581.12/1,392.75
  6. Step 6: Final answer
    x = 857.71

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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.