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Finding the Fourth Proportional to 245.16, 338.65 and 228.69

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Solution

The fourth proportional to 245.16, 338.65 and 228.69 is: 315.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.16 : 338.65 = 228.69 : x
  2. Step 2: Convert to fraction form
    245.16/338.65 = 228.69/x
  3. Step 3: Cross multiply
    245.16x = 338.65 × 228.69
  4. Step 4: Simplify right side
    245.16x = 77,445.30
  5. Step 5: Solve for x
    x = 77,445.30/245.16
  6. Step 6: Final answer
    x = 315.90

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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.