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Finding the Fourth Proportional to 818.77, 1,129.14 and 694.30

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Solution

The fourth proportional to 818.77, 1,129.14 and 694.30 is: 957.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.77 : 1,129.14 = 694.30 : x
  2. Step 2: Convert to fraction form
    818.77/1,129.14 = 694.30/x
  3. Step 3: Cross multiply
    818.77x = 1,129.14 × 694.30
  4. Step 4: Simplify right side
    818.77x = 783,961.90
  5. Step 5: Solve for x
    x = 783,961.90/818.77
  6. Step 6: Final answer
    x = 957.49

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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.