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Finding the Fourth Proportional to 358.72, 537.98 and 139.30

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Solution

The fourth proportional to 358.72, 537.98 and 139.30 is: 208.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.72 : 537.98 = 139.30 : x
  2. Step 2: Convert to fraction form
    358.72/537.98 = 139.30/x
  3. Step 3: Cross multiply
    358.72x = 537.98 × 139.30
  4. Step 4: Simplify right side
    358.72x = 74,940.61
  5. Step 5: Solve for x
    x = 74,940.61/358.72
  6. Step 6: Final answer
    x = 208.91

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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.