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Finding the Fourth Proportional to 405.82, 560.02 and 231.16

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Solution

The fourth proportional to 405.82, 560.02 and 231.16 is: 318.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.82 : 560.02 = 231.16 : x
  2. Step 2: Convert to fraction form
    405.82/560.02 = 231.16/x
  3. Step 3: Cross multiply
    405.82x = 560.02 × 231.16
  4. Step 4: Simplify right side
    405.82x = 129,454.22
  5. Step 5: Solve for x
    x = 129,454.22/405.82
  6. Step 6: Final answer
    x = 318.99

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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.