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Finding the Fourth Proportional to 1,108.51, 1,529.74 and 611.15

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Solution

The fourth proportional to 1,108.51, 1,529.74 and 611.15 is: 843.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.51 : 1,529.74 = 611.15 : x
  2. Step 2: Convert to fraction form
    1,108.51/1,529.74 = 611.15/x
  3. Step 3: Cross multiply
    1,108.51x = 1,529.74 × 611.15
  4. Step 4: Simplify right side
    1,108.51x = 934,898.30
  5. Step 5: Solve for x
    x = 934,898.30/1,108.51
  6. Step 6: Final answer
    x = 843.39

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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.