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Finding the Fourth Proportional to 450.26, 619.85 and 387.75

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Solution

The fourth proportional to 450.26, 619.85 and 387.75 is: 533.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.26 : 619.85 = 387.75 : x
  2. Step 2: Convert to fraction form
    450.26/619.85 = 387.75/x
  3. Step 3: Cross multiply
    450.26x = 619.85 × 387.75
  4. Step 4: Simplify right side
    450.26x = 240,350.13
  5. Step 5: Solve for x
    x = 240,350.13/450.26
  6. Step 6: Final answer
    x = 533.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.