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Finding the Fourth Proportional to 814.46, 1,123.27 and 666.83

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Solution

The fourth proportional to 814.46, 1,123.27 and 666.83 is: 919.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.46 : 1,123.27 = 666.83 : x
  2. Step 2: Convert to fraction form
    814.46/1,123.27 = 666.83/x
  3. Step 3: Cross multiply
    814.46x = 1,123.27 × 666.83
  4. Step 4: Simplify right side
    814.46x = 749,031.28
  5. Step 5: Solve for x
    x = 749,031.28/814.46
  6. Step 6: Final answer
    x = 919.67

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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.