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Finding the Fourth Proportional to 439.62, 606.65 and 253.11

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Solution

The fourth proportional to 439.62, 606.65 and 253.11 is: 349.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.62 : 606.65 = 253.11 : x
  2. Step 2: Convert to fraction form
    439.62/606.65 = 253.11/x
  3. Step 3: Cross multiply
    439.62x = 606.65 × 253.11
  4. Step 4: Simplify right side
    439.62x = 153,549.18
  5. Step 5: Solve for x
    x = 153,549.18/439.62
  6. Step 6: Final answer
    x = 349.28

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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.