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Finding the Fourth Proportional to 380.79, 525.35 and 231.32

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Solution

The fourth proportional to 380.79, 525.35 and 231.32 is: 319.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.79 : 525.35 = 231.32 : x
  2. Step 2: Convert to fraction form
    380.79/525.35 = 231.32/x
  3. Step 3: Cross multiply
    380.79x = 525.35 × 231.32
  4. Step 4: Simplify right side
    380.79x = 121,523.64
  5. Step 5: Solve for x
    x = 121,523.64/380.79
  6. Step 6: Final answer
    x = 319.13

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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.