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Finding the Fourth Proportional to 230.74, 345.78 and 128

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Solution

The fourth proportional to 230.74, 345.78 and 128 is: 191.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.74 : 345.78 = 128 : x
  2. Step 2: Convert to fraction form
    230.74/345.78 = 128/x
  3. Step 3: Cross multiply
    230.74x = 345.78 × 128
  4. Step 4: Simplify right side
    230.74x = 44,259.84
  5. Step 5: Solve for x
    x = 44,259.84/230.74
  6. Step 6: Final answer
    x = 191.82

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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.