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Finding the Fourth Proportional to 847.87, 1,272.20 and 300.31

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Solution

The fourth proportional to 847.87, 1,272.20 and 300.31 is: 450.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.87 : 1,272.20 = 300.31 : x
  2. Step 2: Convert to fraction form
    847.87/1,272.20 = 300.31/x
  3. Step 3: Cross multiply
    847.87x = 1,272.20 × 300.31
  4. Step 4: Simplify right side
    847.87x = 382,048.02
  5. Step 5: Solve for x
    x = 382,048.02/847.87
  6. Step 6: Final answer
    x = 450.60

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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.