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Finding the Fourth Proportional to 405.89, 611.88 and 371.30

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Solution

The fourth proportional to 405.89, 611.88 and 371.30 is: 559.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.89 : 611.88 = 371.30 : x
  2. Step 2: Convert to fraction form
    405.89/611.88 = 371.30/x
  3. Step 3: Cross multiply
    405.89x = 611.88 × 371.30
  4. Step 4: Simplify right side
    405.89x = 227,191.08
  5. Step 5: Solve for x
    x = 227,191.08/405.89
  6. Step 6: Final answer
    x = 559.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.