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Finding the Fourth Proportional to 1,393.56, 2,089.62 and 571.68

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Solution

The fourth proportional to 1,393.56, 2,089.62 and 571.68 is: 857.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.56 : 2,089.62 = 571.68 : x
  2. Step 2: Convert to fraction form
    1,393.56/2,089.62 = 571.68/x
  3. Step 3: Cross multiply
    1,393.56x = 2,089.62 × 571.68
  4. Step 4: Simplify right side
    1,393.56x = 1,194,593.96
  5. Step 5: Solve for x
    x = 1,194,593.96/1,393.56
  6. Step 6: Final answer
    x = 857.22

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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.