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Finding the Fourth Proportional to 851.38, 1,174.87 and 478.39

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Solution

The fourth proportional to 851.38, 1,174.87 and 478.39 is: 660.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.38 : 1,174.87 = 478.39 : x
  2. Step 2: Convert to fraction form
    851.38/1,174.87 = 478.39/x
  3. Step 3: Cross multiply
    851.38x = 1,174.87 × 478.39
  4. Step 4: Simplify right side
    851.38x = 562,046.06
  5. Step 5: Solve for x
    x = 562,046.06/851.38
  6. Step 6: Final answer
    x = 660.16

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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.