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Finding the Fourth Proportional to 228.18, 314.87 and 139.71

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Solution

The fourth proportional to 228.18, 314.87 and 139.71 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.18 : 314.87 = 139.71 : x
  2. Step 2: Convert to fraction form
    228.18/314.87 = 139.71/x
  3. Step 3: Cross multiply
    228.18x = 314.87 × 139.71
  4. Step 4: Simplify right side
    228.18x = 43,990.49
  5. Step 5: Solve for x
    x = 43,990.49/228.18
  6. Step 6: Final answer
    x = 192.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.