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Finding the Fourth Proportional to 847.69, 1,271.75 and 270.56

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Solution

The fourth proportional to 847.69, 1,271.75 and 270.56 is: 405.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.69 : 1,271.75 = 270.56 : x
  2. Step 2: Convert to fraction form
    847.69/1,271.75 = 270.56/x
  3. Step 3: Cross multiply
    847.69x = 1,271.75 × 270.56
  4. Step 4: Simplify right side
    847.69x = 344,086.51
  5. Step 5: Solve for x
    x = 344,086.51/847.69
  6. Step 6: Final answer
    x = 405.91

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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.