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Finding the Fourth Proportional to 155.87, 215.36 and 136.43

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Solution

The fourth proportional to 155.87, 215.36 and 136.43 is: 188.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.87 : 215.36 = 136.43 : x
  2. Step 2: Convert to fraction form
    155.87/215.36 = 136.43/x
  3. Step 3: Cross multiply
    155.87x = 215.36 × 136.43
  4. Step 4: Simplify right side
    155.87x = 29,381.56
  5. Step 5: Solve for x
    x = 29,381.56/155.87
  6. Step 6: Final answer
    x = 188.50

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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.