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Finding the Fourth Proportional to 250.45, 375.74 and 128.64

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Solution

The fourth proportional to 250.45, 375.74 and 128.64 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.45 : 375.74 = 128.64 : x
  2. Step 2: Convert to fraction form
    250.45/375.74 = 128.64/x
  3. Step 3: Cross multiply
    250.45x = 375.74 × 128.64
  4. Step 4: Simplify right side
    250.45x = 48,335.19
  5. Step 5: Solve for x
    x = 48,335.19/250.45
  6. Step 6: Final answer
    x = 192.99

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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.