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Finding the Fourth Proportional to 135.51, 187.21 and 115.02

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Solution

The fourth proportional to 135.51, 187.21 and 115.02 is: 158.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.51 : 187.21 = 115.02 : x
  2. Step 2: Convert to fraction form
    135.51/187.21 = 115.02/x
  3. Step 3: Cross multiply
    135.51x = 187.21 × 115.02
  4. Step 4: Simplify right side
    135.51x = 21,533.04
  5. Step 5: Solve for x
    x = 21,533.04/135.51
  6. Step 6: Final answer
    x = 158.91

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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.