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Finding the Fourth Proportional to 1,393.74, 2,090.21 and 571.59

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Solution

The fourth proportional to 1,393.74, 2,090.21 and 571.59 is: 857.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.74 : 2,090.21 = 571.59 : x
  2. Step 2: Convert to fraction form
    1,393.74/2,090.21 = 571.59/x
  3. Step 3: Cross multiply
    1,393.74x = 2,090.21 × 571.59
  4. Step 4: Simplify right side
    1,393.74x = 1,194,740.28
  5. Step 5: Solve for x
    x = 1,194,740.28/1,393.74
  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.