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Finding the Fourth Proportional to 159.15, 238.77 and 128.64

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Solution

The fourth proportional to 159.15, 238.77 and 128.64 is: 193.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.15 : 238.77 = 128.64 : x
  2. Step 2: Convert to fraction form
    159.15/238.77 = 128.64/x
  3. Step 3: Cross multiply
    159.15x = 238.77 × 128.64
  4. Step 4: Simplify right side
    159.15x = 30,715.37
  5. Step 5: Solve for x
    x = 30,715.37/159.15
  6. Step 6: Final answer
    x = 193.00

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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.