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Finding the Fourth Proportional to 513.12, 769.48 and 188.31

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Solution

The fourth proportional to 513.12, 769.48 and 188.31 is: 282.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.12 : 769.48 = 188.31 : x
  2. Step 2: Convert to fraction form
    513.12/769.48 = 188.31/x
  3. Step 3: Cross multiply
    513.12x = 769.48 × 188.31
  4. Step 4: Simplify right side
    513.12x = 144,899.84
  5. Step 5: Solve for x
    x = 144,899.84/513.12
  6. Step 6: Final answer
    x = 282.39

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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.