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Finding the Fourth Proportional to 135.37, 202.74 and 87.13

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Solution

The fourth proportional to 135.37, 202.74 and 87.13 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.37 : 202.74 = 87.13 : x
  2. Step 2: Convert to fraction form
    135.37/202.74 = 87.13/x
  3. Step 3: Cross multiply
    135.37x = 202.74 × 87.13
  4. Step 4: Simplify right side
    135.37x = 17,664.74
  5. Step 5: Solve for x
    x = 17,664.74/135.37
  6. Step 6: Final answer
    x = 130.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.