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Finding the Fourth Proportional to 1,489.54, 2,234.14 and 393.99

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Solution

The fourth proportional to 1,489.54, 2,234.14 and 393.99 is: 590.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.54 : 2,234.14 = 393.99 : x
  2. Step 2: Convert to fraction form
    1,489.54/2,234.14 = 393.99/x
  3. Step 3: Cross multiply
    1,489.54x = 2,234.14 × 393.99
  4. Step 4: Simplify right side
    1,489.54x = 880,233.13
  5. Step 5: Solve for x
    x = 880,233.13/1,489.54
  6. Step 6: Final answer
    x = 590.94

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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.