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Finding the Fourth Proportional to 851.27, 1,174.68 and 478.30

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Solution

The fourth proportional to 851.27, 1,174.68 and 478.30 is: 660.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.27 : 1,174.68 = 478.30 : x
  2. Step 2: Convert to fraction form
    851.27/1,174.68 = 478.30/x
  3. Step 3: Cross multiply
    851.27x = 1,174.68 × 478.30
  4. Step 4: Simplify right side
    851.27x = 561,849.44
  5. Step 5: Solve for x
    x = 561,849.44/851.27
  6. Step 6: Final answer
    x = 660.01

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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.