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Finding the Fourth Proportional to 1,108.71, 1,529.99 and 611.37

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Solution

The fourth proportional to 1,108.71, 1,529.99 and 611.37 is: 843.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.71 : 1,529.99 = 611.37 : x
  2. Step 2: Convert to fraction form
    1,108.71/1,529.99 = 611.37/x
  3. Step 3: Cross multiply
    1,108.71x = 1,529.99 × 611.37
  4. Step 4: Simplify right side
    1,108.71x = 935,393.53
  5. Step 5: Solve for x
    x = 935,393.53/1,108.71
  6. Step 6: Final answer
    x = 843.68

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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.