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Finding the Fourth Proportional to 752.78, 1,129.10 and 205.02

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Solution

The fourth proportional to 752.78, 1,129.10 and 205.02 is: 307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.78 : 1,129.10 = 205.02 : x
  2. Step 2: Convert to fraction form
    752.78/1,129.10 = 205.02/x
  3. Step 3: Cross multiply
    752.78x = 1,129.10 × 205.02
  4. Step 4: Simplify right side
    752.78x = 231,488.08
  5. Step 5: Solve for x
    x = 231,488.08/752.78
  6. Step 6: Final answer
    x = 307.51

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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.