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Finding the Fourth Proportional to 851.34, 1,277.21 and 331.35

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Solution

The fourth proportional to 851.34, 1,277.21 and 331.35 is: 497.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.34 : 1,277.21 = 331.35 : x
  2. Step 2: Convert to fraction form
    851.34/1,277.21 = 331.35/x
  3. Step 3: Cross multiply
    851.34x = 1,277.21 × 331.35
  4. Step 4: Simplify right side
    851.34x = 423,203.53
  5. Step 5: Solve for x
    x = 423,203.53/851.34
  6. Step 6: Final answer
    x = 497.10

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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.