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Finding the Fourth Proportional to 221.16, 305.31 and 151.32

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Solution

The fourth proportional to 221.16, 305.31 and 151.32 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.16 : 305.31 = 151.32 : x
  2. Step 2: Convert to fraction form
    221.16/305.31 = 151.32/x
  3. Step 3: Cross multiply
    221.16x = 305.31 × 151.32
  4. Step 4: Simplify right side
    221.16x = 46,199.51
  5. Step 5: Solve for x
    x = 46,199.51/221.16
  6. Step 6: Final answer
    x = 208.90

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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.