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Finding the Fourth Proportional to 1,108.99, 1,530.42 and 611.65

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Solution

The fourth proportional to 1,108.99, 1,530.42 and 611.65 is: 844.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.99 : 1,530.42 = 611.65 : x
  2. Step 2: Convert to fraction form
    1,108.99/1,530.42 = 611.65/x
  3. Step 3: Cross multiply
    1,108.99x = 1,530.42 × 611.65
  4. Step 4: Simplify right side
    1,108.99x = 936,081.39
  5. Step 5: Solve for x
    x = 936,081.39/1,108.99
  6. Step 6: Final answer
    x = 844.08

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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.