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Finding the Fourth Proportional to 438.70, 605.40 and 242.21

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Solution

The fourth proportional to 438.70, 605.40 and 242.21 is: 334.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.70 : 605.40 = 242.21 : x
  2. Step 2: Convert to fraction form
    438.70/605.40 = 242.21/x
  3. Step 3: Cross multiply
    438.70x = 605.40 × 242.21
  4. Step 4: Simplify right side
    438.70x = 146,633.93
  5. Step 5: Solve for x
    x = 146,633.93/438.70
  6. Step 6: Final answer
    x = 334.25

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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.