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Finding the Fourth Proportional to 767.25, 1,150.83 and 420.72

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Solution

The fourth proportional to 767.25, 1,150.83 and 420.72 is: 631.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.25 : 1,150.83 = 420.72 : x
  2. Step 2: Convert to fraction form
    767.25/1,150.83 = 420.72/x
  3. Step 3: Cross multiply
    767.25x = 1,150.83 × 420.72
  4. Step 4: Simplify right side
    767.25x = 484,177.20
  5. Step 5: Solve for x
    x = 484,177.20/767.25
  6. Step 6: Final answer
    x = 631.06

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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.