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Finding the Fourth Proportional to 833.45, 1,247.87 and 420.57

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Solution

The fourth proportional to 833.45, 1,247.87 and 420.57 is: 629.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.45 : 1,247.87 = 420.57 : x
  2. Step 2: Convert to fraction form
    833.45/1,247.87 = 420.57/x
  3. Step 3: Cross multiply
    833.45x = 1,247.87 × 420.57
  4. Step 4: Simplify right side
    833.45x = 524,816.16
  5. Step 5: Solve for x
    x = 524,816.16/833.45
  6. Step 6: Final answer
    x = 629.69

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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.