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Finding the Fourth Proportional to 269.16, 403.59 and 139.22

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Solution

The fourth proportional to 269.16, 403.59 and 139.22 is: 208.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.16 : 403.59 = 139.22 : x
  2. Step 2: Convert to fraction form
    269.16/403.59 = 139.22/x
  3. Step 3: Cross multiply
    269.16x = 403.59 × 139.22
  4. Step 4: Simplify right side
    269.16x = 56,185.78
  5. Step 5: Solve for x
    x = 56,185.78/269.16
  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.