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Finding the Fourth Proportional to 851.85, 1,272.59 and 541.21

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Solution

The fourth proportional to 851.85, 1,272.59 and 541.21 is: 808.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.85 : 1,272.59 = 541.21 : x
  2. Step 2: Convert to fraction form
    851.85/1,272.59 = 541.21/x
  3. Step 3: Cross multiply
    851.85x = 1,272.59 × 541.21
  4. Step 4: Simplify right side
    851.85x = 688,738.43
  5. Step 5: Solve for x
    x = 688,738.43/851.85
  6. Step 6: Final answer
    x = 808.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.