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Finding the Fourth Proportional to 1,487.75, 2,231.64 and 513.86

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Solution

The fourth proportional to 1,487.75, 2,231.64 and 513.86 is: 770.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.75 : 2,231.64 = 513.86 : x
  2. Step 2: Convert to fraction form
    1,487.75/2,231.64 = 513.86/x
  3. Step 3: Cross multiply
    1,487.75x = 2,231.64 × 513.86
  4. Step 4: Simplify right side
    1,487.75x = 1,146,739.37
  5. Step 5: Solve for x
    x = 1,146,739.37/1,487.75
  6. Step 6: Final answer
    x = 770.79

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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.