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Finding the Fourth Proportional to 752.83, 1,129.23 and 427.50

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Solution

The fourth proportional to 752.83, 1,129.23 and 427.50 is: 641.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.83 : 1,129.23 = 427.50 : x
  2. Step 2: Convert to fraction form
    752.83/1,129.23 = 427.50/x
  3. Step 3: Cross multiply
    752.83x = 1,129.23 × 427.50
  4. Step 4: Simplify right side
    752.83x = 482,745.83
  5. Step 5: Solve for x
    x = 482,745.83/752.83
  6. Step 6: Final answer
    x = 641.24

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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.