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Finding the Fourth Proportional to 851.12, 1,174.54 and 478.12

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Solution

The fourth proportional to 851.12, 1,174.54 and 478.12 is: 659.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.12 : 1,174.54 = 478.12 : x
  2. Step 2: Convert to fraction form
    851.12/1,174.54 = 478.12/x
  3. Step 3: Cross multiply
    851.12x = 1,174.54 × 478.12
  4. Step 4: Simplify right side
    851.12x = 561,571.06
  5. Step 5: Solve for x
    x = 561,571.06/851.12
  6. Step 6: Final answer
    x = 659.80

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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.