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Finding the Fourth Proportional to 155.60, 214.78 and 142.40

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Solution

The fourth proportional to 155.60, 214.78 and 142.40 is: 196.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.60 : 214.78 = 142.40 : x
  2. Step 2: Convert to fraction form
    155.60/214.78 = 142.40/x
  3. Step 3: Cross multiply
    155.60x = 214.78 × 142.40
  4. Step 4: Simplify right side
    155.60x = 30,584.67
  5. Step 5: Solve for x
    x = 30,584.67/155.60
  6. Step 6: Final answer
    x = 196.56

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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.