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Finding the Fourth Proportional to 228.09, 314.66 and 139.55

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Solution

The fourth proportional to 228.09, 314.66 and 139.55 is: 192.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.09 : 314.66 = 139.55 : x
  2. Step 2: Convert to fraction form
    228.09/314.66 = 139.55/x
  3. Step 3: Cross multiply
    228.09x = 314.66 × 139.55
  4. Step 4: Simplify right side
    228.09x = 43,909.58
  5. Step 5: Solve for x
    x = 43,909.58/228.09
  6. Step 6: Final answer
    x = 192.51

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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.