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Finding the Fourth Proportional to 851.36, 1,277.40 and 418.52

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Solution

The fourth proportional to 851.36, 1,277.40 and 418.52 is: 627.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.36 : 1,277.40 = 418.52 : x
  2. Step 2: Convert to fraction form
    851.36/1,277.40 = 418.52/x
  3. Step 3: Cross multiply
    851.36x = 1,277.40 × 418.52
  4. Step 4: Simplify right side
    851.36x = 534,617.45
  5. Step 5: Solve for x
    x = 534,617.45/851.36
  6. Step 6: Final answer
    x = 627.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.