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Finding the Fourth Proportional to 356.32, 534.20 and 140

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Solution

The fourth proportional to 356.32, 534.20 and 140 is: 209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.32 : 534.20 = 140 : x
  2. Step 2: Convert to fraction form
    356.32/534.20 = 140/x
  3. Step 3: Cross multiply
    356.32x = 534.20 × 140
  4. Step 4: Simplify right side
    356.32x = 74,788
  5. Step 5: Solve for x
    x = 74,788/356.32
  6. Step 6: Final answer
    x = 209.89

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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.