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Finding the Fourth Proportional to 438.66, 605.36 and 242.18

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Solution

The fourth proportional to 438.66, 605.36 and 242.18 is: 334.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.66 : 605.36 = 242.18 : x
  2. Step 2: Convert to fraction form
    438.66/605.36 = 242.18/x
  3. Step 3: Cross multiply
    438.66x = 605.36 × 242.18
  4. Step 4: Simplify right side
    438.66x = 146,601.85
  5. Step 5: Solve for x
    x = 146,601.85/438.66
  6. Step 6: Final answer
    x = 334.20

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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.