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Finding the Fourth Proportional to 821.77, 1,233.15 and 359.54

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Solution

The fourth proportional to 821.77, 1,233.15 and 359.54 is: 539.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.77 : 1,233.15 = 359.54 : x
  2. Step 2: Convert to fraction form
    821.77/1,233.15 = 359.54/x
  3. Step 3: Cross multiply
    821.77x = 1,233.15 × 359.54
  4. Step 4: Simplify right side
    821.77x = 443,364.87
  5. Step 5: Solve for x
    x = 443,364.87/821.77
  6. Step 6: Final answer
    x = 539.52

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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.