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Finding the Fourth Proportional to 847.62, 1,271.81 and 539.39

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Solution

The fourth proportional to 847.62, 1,271.81 and 539.39 is: 809.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.62 : 1,271.81 = 539.39 : x
  2. Step 2: Convert to fraction form
    847.62/1,271.81 = 539.39/x
  3. Step 3: Cross multiply
    847.62x = 1,271.81 × 539.39
  4. Step 4: Simplify right side
    847.62x = 686,006.12
  5. Step 5: Solve for x
    x = 686,006.12/847.62
  6. Step 6: Final answer
    x = 809.33

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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.