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Finding the Fourth Proportional to 155.21, 213.68 and 147.51

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Solution

The fourth proportional to 155.21, 213.68 and 147.51 is: 203.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.21 : 213.68 = 147.51 : x
  2. Step 2: Convert to fraction form
    155.21/213.68 = 147.51/x
  3. Step 3: Cross multiply
    155.21x = 213.68 × 147.51
  4. Step 4: Simplify right side
    155.21x = 31,519.20
  5. Step 5: Solve for x
    x = 31,519.20/155.21
  6. Step 6: Final answer
    x = 203.08

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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.