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Finding the Fourth Proportional to 851.90, 1,277.85 and 235.70

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Solution

The fourth proportional to 851.90, 1,277.85 and 235.70 is: 353.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.90 : 1,277.85 = 235.70 : x
  2. Step 2: Convert to fraction form
    851.90/1,277.85 = 235.70/x
  3. Step 3: Cross multiply
    851.90x = 1,277.85 × 235.70
  4. Step 4: Simplify right side
    851.90x = 301,189.25
  5. Step 5: Solve for x
    x = 301,189.25/851.90
  6. Step 6: Final answer
    x = 353.55

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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.