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Finding the Fourth Proportional to 818.30, 1,129.95 and 694.37

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Solution

The fourth proportional to 818.30, 1,129.95 and 694.37 is: 958.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.30 : 1,129.95 = 694.37 : x
  2. Step 2: Convert to fraction form
    818.30/1,129.95 = 694.37/x
  3. Step 3: Cross multiply
    818.30x = 1,129.95 × 694.37
  4. Step 4: Simplify right side
    818.30x = 784,606.21
  5. Step 5: Solve for x
    x = 784,606.21/818.30
  6. Step 6: Final answer
    x = 958.82

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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.