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Finding the Fourth Proportional to 356.49, 534.78 and 140.09

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Solution

The fourth proportional to 356.49, 534.78 and 140.09 is: 210.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.49 : 534.78 = 140.09 : x
  2. Step 2: Convert to fraction form
    356.49/534.78 = 140.09/x
  3. Step 3: Cross multiply
    356.49x = 534.78 × 140.09
  4. Step 4: Simplify right side
    356.49x = 74,914.66
  5. Step 5: Solve for x
    x = 74,914.66/356.49
  6. Step 6: Final answer
    x = 210.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.