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Finding the Fourth Proportional to 1,108.72, 1,529.40 and 694

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Solution

The fourth proportional to 1,108.72, 1,529.40 and 694 is: 957.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.72 : 1,529.40 = 694 : x
  2. Step 2: Convert to fraction form
    1,108.72/1,529.40 = 694/x
  3. Step 3: Cross multiply
    1,108.72x = 1,529.40 × 694
  4. Step 4: Simplify right side
    1,108.72x = 1,061,403.60
  5. Step 5: Solve for x
    x = 1,061,403.60/1,108.72
  6. Step 6: Final answer
    x = 957.32

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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.