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Finding the Fourth Proportional to 155.56, 214.78 and 103.15

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Solution

The fourth proportional to 155.56, 214.78 and 103.15 is: 142.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.56 : 214.78 = 103.15 : x
  2. Step 2: Convert to fraction form
    155.56/214.78 = 103.15/x
  3. Step 3: Cross multiply
    155.56x = 214.78 × 103.15
  4. Step 4: Simplify right side
    155.56x = 22,154.56
  5. Step 5: Solve for x
    x = 22,154.56/155.56
  6. Step 6: Final answer
    x = 142.42

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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.