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Finding the Fourth Proportional to 228.32, 315.05 and 139.76

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Solution

The fourth proportional to 228.32, 315.05 and 139.76 is: 192.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.32 : 315.05 = 139.76 : x
  2. Step 2: Convert to fraction form
    228.32/315.05 = 139.76/x
  3. Step 3: Cross multiply
    228.32x = 315.05 × 139.76
  4. Step 4: Simplify right side
    228.32x = 44,031.39
  5. Step 5: Solve for x
    x = 44,031.39/228.32
  6. Step 6: Final answer
    x = 192.85

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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.