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Finding the Fourth Proportional to 851.38, 1,277.40 and 609.82

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Solution

The fourth proportional to 851.38, 1,277.40 and 609.82 is: 914.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.38 : 1,277.40 = 609.82 : x
  2. Step 2: Convert to fraction form
    851.38/1,277.40 = 609.82/x
  3. Step 3: Cross multiply
    851.38x = 1,277.40 × 609.82
  4. Step 4: Simplify right side
    851.38x = 778,984.07
  5. Step 5: Solve for x
    x = 778,984.07/851.38
  6. Step 6: Final answer
    x = 914.97

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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.