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Finding the Fourth Proportional to 355.76, 533.78 and 139.30

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Solution

The fourth proportional to 355.76, 533.78 and 139.30 is: 209.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.76 : 533.78 = 139.30 : x
  2. Step 2: Convert to fraction form
    355.76/533.78 = 139.30/x
  3. Step 3: Cross multiply
    355.76x = 533.78 × 139.30
  4. Step 4: Simplify right side
    355.76x = 74,355.55
  5. Step 5: Solve for x
    x = 74,355.55/355.76
  6. Step 6: Final answer
    x = 209.00

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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.