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Finding the Fourth Proportional to 1,216.15, 1,822.40 and 728.66

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Solution

The fourth proportional to 1,216.15, 1,822.40 and 728.66 is: 1,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.15 : 1,822.40 = 728.66 : x
  2. Step 2: Convert to fraction form
    1,216.15/1,822.40 = 728.66/x
  3. Step 3: Cross multiply
    1,216.15x = 1,822.40 × 728.66
  4. Step 4: Simplify right side
    1,216.15x = 1,327,913.63
  5. Step 5: Solve for x
    x = 1,327,913.63/1,216.15
  6. Step 6: Final answer
    x = 1,091.90

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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.