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Finding the Fourth Proportional to 155.18, 215.66 and 153.51

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Solution

The fourth proportional to 155.18, 215.66 and 153.51 is: 213.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.18 : 215.66 = 153.51 : x
  2. Step 2: Convert to fraction form
    155.18/215.66 = 153.51/x
  3. Step 3: Cross multiply
    155.18x = 215.66 × 153.51
  4. Step 4: Simplify right side
    155.18x = 33,105.20
  5. Step 5: Solve for x
    x = 33,105.20/155.18
  6. Step 6: Final answer
    x = 213.34

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.