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Finding the Fourth Proportional to 355.61, 533.55 and 139.13

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Solution

The fourth proportional to 355.61, 533.55 and 139.13 is: 208.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.61 : 533.55 = 139.13 : x
  2. Step 2: Convert to fraction form
    355.61/533.55 = 139.13/x
  3. Step 3: Cross multiply
    355.61x = 533.55 × 139.13
  4. Step 4: Simplify right side
    355.61x = 74,230.14
  5. Step 5: Solve for x
    x = 74,230.14/355.61
  6. Step 6: Final answer
    x = 208.74

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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.