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Finding the Fourth Proportional to 438.52, 605.46 and 355.80

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Solution

The fourth proportional to 438.52, 605.46 and 355.80 is: 491.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.52 : 605.46 = 355.80 : x
  2. Step 2: Convert to fraction form
    438.52/605.46 = 355.80/x
  3. Step 3: Cross multiply
    438.52x = 605.46 × 355.80
  4. Step 4: Simplify right side
    438.52x = 215,422.67
  5. Step 5: Solve for x
    x = 215,422.67/438.52
  6. Step 6: Final answer
    x = 491.25

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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.