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Finding the Fourth Proportional to 847.75, 1,271.68 and 540.20

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Solution

The fourth proportional to 847.75, 1,271.68 and 540.20 is: 810.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.75 : 1,271.68 = 540.20 : x
  2. Step 2: Convert to fraction form
    847.75/1,271.68 = 540.20/x
  3. Step 3: Cross multiply
    847.75x = 1,271.68 × 540.20
  4. Step 4: Simplify right side
    847.75x = 686,960.87
  5. Step 5: Solve for x
    x = 686,960.87/847.75
  6. Step 6: Final answer
    x = 810.34

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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.