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Finding the Fourth Proportional to 775.11, 1,160.67 and 428.06

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Solution

The fourth proportional to 775.11, 1,160.67 and 428.06 is: 640.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.11 : 1,160.67 = 428.06 : x
  2. Step 2: Convert to fraction form
    775.11/1,160.67 = 428.06/x
  3. Step 3: Cross multiply
    775.11x = 1,160.67 × 428.06
  4. Step 4: Simplify right side
    775.11x = 496,830.60
  5. Step 5: Solve for x
    x = 496,830.60/775.11
  6. Step 6: Final answer
    x = 640.98

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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.