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Finding the Fourth Proportional to 356.20, 533.90 and 139.62

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Solution

The fourth proportional to 356.20, 533.90 and 139.62 is: 209.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.20 : 533.90 = 139.62 : x
  2. Step 2: Convert to fraction form
    356.20/533.90 = 139.62/x
  3. Step 3: Cross multiply
    356.20x = 533.90 × 139.62
  4. Step 4: Simplify right side
    356.20x = 74,543.12
  5. Step 5: Solve for x
    x = 74,543.12/356.20
  6. Step 6: Final answer
    x = 209.27

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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.