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Finding the Fourth Proportional to 1,119.87, 1,678.59 and 753.75

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Solution

The fourth proportional to 1,119.87, 1,678.59 and 753.75 is: 1,129.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.87 : 1,678.59 = 753.75 : x
  2. Step 2: Convert to fraction form
    1,119.87/1,678.59 = 753.75/x
  3. Step 3: Cross multiply
    1,119.87x = 1,678.59 × 753.75
  4. Step 4: Simplify right side
    1,119.87x = 1,265,237.21
  5. Step 5: Solve for x
    x = 1,265,237.21/1,119.87
  6. Step 6: Final answer
    x = 1,129.81

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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.