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Finding the Fourth Proportional to 753.26, 1,129.74 and 205.30

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Solution

The fourth proportional to 753.26, 1,129.74 and 205.30 is: 307.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.26 : 1,129.74 = 205.30 : x
  2. Step 2: Convert to fraction form
    753.26/1,129.74 = 205.30/x
  3. Step 3: Cross multiply
    753.26x = 1,129.74 × 205.30
  4. Step 4: Simplify right side
    753.26x = 231,935.62
  5. Step 5: Solve for x
    x = 231,935.62/753.26
  6. Step 6: Final answer
    x = 307.91

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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.