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Finding the Fourth Proportional to 1,109.29, 1,530.74 and 611.90

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Solution

The fourth proportional to 1,109.29, 1,530.74 and 611.90 is: 844.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.29 : 1,530.74 = 611.90 : x
  2. Step 2: Convert to fraction form
    1,109.29/1,530.74 = 611.90/x
  3. Step 3: Cross multiply
    1,109.29x = 1,530.74 × 611.90
  4. Step 4: Simplify right side
    1,109.29x = 936,659.81
  5. Step 5: Solve for x
    x = 936,659.81/1,109.29
  6. Step 6: Final answer
    x = 844.38

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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.