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Finding the Fourth Proportional to 1,221.64, 1,833.11 and 572.38

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Solution

The fourth proportional to 1,221.64, 1,833.11 and 572.38 is: 858.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.64 : 1,833.11 = 572.38 : x
  2. Step 2: Convert to fraction form
    1,221.64/1,833.11 = 572.38/x
  3. Step 3: Cross multiply
    1,221.64x = 1,833.11 × 572.38
  4. Step 4: Simplify right side
    1,221.64x = 1,049,235.50
  5. Step 5: Solve for x
    x = 1,049,235.50/1,221.64
  6. Step 6: Final answer
    x = 858.87

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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.