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Finding the Fourth Proportional to 1,109.30, 1,530.87 and 611.99

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Solution

The fourth proportional to 1,109.30, 1,530.87 and 611.99 is: 844.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.30 : 1,530.87 = 611.99 : x
  2. Step 2: Convert to fraction form
    1,109.30/1,530.87 = 611.99/x
  3. Step 3: Cross multiply
    1,109.30x = 1,530.87 × 611.99
  4. Step 4: Simplify right side
    1,109.30x = 936,872.92
  5. Step 5: Solve for x
    x = 936,872.92/1,109.30
  6. Step 6: Final answer
    x = 844.57

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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.