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Finding the Fourth Proportional to 1,109.21, 1,530.73 and 611.87

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Solution

The fourth proportional to 1,109.21, 1,530.73 and 611.87 is: 844.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.21 : 1,530.73 = 611.87 : x
  2. Step 2: Convert to fraction form
    1,109.21/1,530.73 = 611.87/x
  3. Step 3: Cross multiply
    1,109.21x = 1,530.73 × 611.87
  4. Step 4: Simplify right side
    1,109.21x = 936,604.71
  5. Step 5: Solve for x
    x = 936,604.71/1,109.21
  6. Step 6: Final answer
    x = 844.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.