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Finding the Fourth Proportional to 505.45, 758.40 and 231.40

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Solution

The fourth proportional to 505.45, 758.40 and 231.40 is: 347.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.45 : 758.40 = 231.40 : x
  2. Step 2: Convert to fraction form
    505.45/758.40 = 231.40/x
  3. Step 3: Cross multiply
    505.45x = 758.40 × 231.40
  4. Step 4: Simplify right side
    505.45x = 175,493.76
  5. Step 5: Solve for x
    x = 175,493.76/505.45
  6. Step 6: Final answer
    x = 347.20

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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.