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Finding the Fourth Proportional to 155.88, 215.07 and 109.38

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Solution

The fourth proportional to 155.88, 215.07 and 109.38 is: 150.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.88 : 215.07 = 109.38 : x
  2. Step 2: Convert to fraction form
    155.88/215.07 = 109.38/x
  3. Step 3: Cross multiply
    155.88x = 215.07 × 109.38
  4. Step 4: Simplify right side
    155.88x = 23,524.36
  5. Step 5: Solve for x
    x = 23,524.36/155.88
  6. Step 6: Final answer
    x = 150.91

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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.