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Finding the Fourth Proportional to 753.18, 1,129.75 and 205.35

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Solution

The fourth proportional to 753.18, 1,129.75 and 205.35 is: 308.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.18 : 1,129.75 = 205.35 : x
  2. Step 2: Convert to fraction form
    753.18/1,129.75 = 205.35/x
  3. Step 3: Cross multiply
    753.18x = 1,129.75 × 205.35
  4. Step 4: Simplify right side
    753.18x = 231,993.14
  5. Step 5: Solve for x
    x = 231,993.14/753.18
  6. Step 6: Final answer
    x = 308.02

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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.