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Finding the Fourth Proportional to 405.13, 559.12 and 247.72

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Solution

The fourth proportional to 405.13, 559.12 and 247.72 is: 341.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.13 : 559.12 = 247.72 : x
  2. Step 2: Convert to fraction form
    405.13/559.12 = 247.72/x
  3. Step 3: Cross multiply
    405.13x = 559.12 × 247.72
  4. Step 4: Simplify right side
    405.13x = 138,505.21
  5. Step 5: Solve for x
    x = 138,505.21/405.13
  6. Step 6: Final answer
    x = 341.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.