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Finding the Fourth Proportional to 1,415.73, 2,123.56 and 389.73

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Solution

The fourth proportional to 1,415.73, 2,123.56 and 389.73 is: 584.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.73 : 2,123.56 = 389.73 : x
  2. Step 2: Convert to fraction form
    1,415.73/2,123.56 = 389.73/x
  3. Step 3: Cross multiply
    1,415.73x = 2,123.56 × 389.73
  4. Step 4: Simplify right side
    1,415.73x = 827,615.04
  5. Step 5: Solve for x
    x = 827,615.04/1,415.73
  6. Step 6: Final answer
    x = 584.59

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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.