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Finding the Fourth Proportional to 1,189, 1,783.50 and 505

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Solution

The fourth proportional to 1,189, 1,783.50 and 505 is: 757.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189 : 1,783.50 = 505 : x
  2. Step 2: Convert to fraction form
    1,189/1,783.50 = 505/x
  3. Step 3: Cross multiply
    1,189x = 1,783.50 × 505
  4. Step 4: Simplify right side
    1,189x = 900,667.50
  5. Step 5: Solve for x
    x = 900,667.50/1,189
  6. Step 6: Final answer
    x = 757.50

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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.