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Finding the Fourth Proportional to 847.51, 1,271.21 and 270.38

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Solution

The fourth proportional to 847.51, 1,271.21 and 270.38 is: 405.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.51 : 1,271.21 = 270.38 : x
  2. Step 2: Convert to fraction form
    847.51/1,271.21 = 270.38/x
  3. Step 3: Cross multiply
    847.51x = 1,271.21 × 270.38
  4. Step 4: Simplify right side
    847.51x = 343,711.59
  5. Step 5: Solve for x
    x = 343,711.59/847.51
  6. Step 6: Final answer
    x = 405.56

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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.