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Finding the Fourth Proportional to 438.87, 605.84 and 315.15

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Solution

The fourth proportional to 438.87, 605.84 and 315.15 is: 435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.87 : 605.84 = 315.15 : x
  2. Step 2: Convert to fraction form
    438.87/605.84 = 315.15/x
  3. Step 3: Cross multiply
    438.87x = 605.84 × 315.15
  4. Step 4: Simplify right side
    438.87x = 190,930.48
  5. Step 5: Solve for x
    x = 190,930.48/438.87
  6. Step 6: Final answer
    x = 435.05

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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.