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Finding the Fourth Proportional to 226.66, 312.90 and 156.72

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Solution

The fourth proportional to 226.66, 312.90 and 156.72 is: 216.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.66 : 312.90 = 156.72 : x
  2. Step 2: Convert to fraction form
    226.66/312.90 = 156.72/x
  3. Step 3: Cross multiply
    226.66x = 312.90 × 156.72
  4. Step 4: Simplify right side
    226.66x = 49,037.69
  5. Step 5: Solve for x
    x = 49,037.69/226.66
  6. Step 6: Final answer
    x = 216.35

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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.