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Finding the Fourth Proportional to 228.37, 315.17 and 139.85

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Solution

The fourth proportional to 228.37, 315.17 and 139.85 is: 193.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.37 : 315.17 = 139.85 : x
  2. Step 2: Convert to fraction form
    228.37/315.17 = 139.85/x
  3. Step 3: Cross multiply
    228.37x = 315.17 × 139.85
  4. Step 4: Simplify right side
    228.37x = 44,075.30
  5. Step 5: Solve for x
    x = 44,075.30/228.37
  6. Step 6: Final answer
    x = 193.00

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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.