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Finding the Fourth Proportional to 1,108.36, 1,530.66 and 847

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Solution

The fourth proportional to 1,108.36, 1,530.66 and 847 is: 1,169.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.36 : 1,530.66 = 847 : x
  2. Step 2: Convert to fraction form
    1,108.36/1,530.66 = 847/x
  3. Step 3: Cross multiply
    1,108.36x = 1,530.66 × 847
  4. Step 4: Simplify right side
    1,108.36x = 1,296,469.02
  5. Step 5: Solve for x
    x = 1,296,469.02/1,108.36
  6. Step 6: Final answer
    x = 1,169.72

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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.