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Finding the Fourth Proportional to 253.49, 349.79 and 155.34

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Solution

The fourth proportional to 253.49, 349.79 and 155.34 is: 214.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.49 : 349.79 = 155.34 : x
  2. Step 2: Convert to fraction form
    253.49/349.79 = 155.34/x
  3. Step 3: Cross multiply
    253.49x = 349.79 × 155.34
  4. Step 4: Simplify right side
    253.49x = 54,335.60
  5. Step 5: Solve for x
    x = 54,335.60/253.49
  6. Step 6: Final answer
    x = 214.35

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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.