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Finding the Fourth Proportional to 1,173.50, 1,757.65 and 761.38

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Solution

The fourth proportional to 1,173.50, 1,757.65 and 761.38 is: 1,140.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.50 : 1,757.65 = 761.38 : x
  2. Step 2: Convert to fraction form
    1,173.50/1,757.65 = 761.38/x
  3. Step 3: Cross multiply
    1,173.50x = 1,757.65 × 761.38
  4. Step 4: Simplify right side
    1,173.50x = 1,338,239.56
  5. Step 5: Solve for x
    x = 1,338,239.56/1,173.50
  6. Step 6: Final answer
    x = 1,140.38

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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.