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Finding the Fourth Proportional to 811.52, 1,213.44 and 547.20

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Solution

The fourth proportional to 811.52, 1,213.44 and 547.20 is: 818.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.52 : 1,213.44 = 547.20 : x
  2. Step 2: Convert to fraction form
    811.52/1,213.44 = 547.20/x
  3. Step 3: Cross multiply
    811.52x = 1,213.44 × 547.20
  4. Step 4: Simplify right side
    811.52x = 663,994.37
  5. Step 5: Solve for x
    x = 663,994.37/811.52
  6. Step 6: Final answer
    x = 818.21

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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.