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Finding the Fourth Proportional to 155.41, 214.45 and 100.05

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Solution

The fourth proportional to 155.41, 214.45 and 100.05 is: 138.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.41 : 214.45 = 100.05 : x
  2. Step 2: Convert to fraction form
    155.41/214.45 = 100.05/x
  3. Step 3: Cross multiply
    155.41x = 214.45 × 100.05
  4. Step 4: Simplify right side
    155.41x = 21,455.72
  5. Step 5: Solve for x
    x = 21,455.72/155.41
  6. Step 6: Final answer
    x = 138.06

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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.