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Finding the Fourth Proportional to 250.42, 375.70 and 128.77

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Solution

The fourth proportional to 250.42, 375.70 and 128.77 is: 193.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.42 : 375.70 = 128.77 : x
  2. Step 2: Convert to fraction form
    250.42/375.70 = 128.77/x
  3. Step 3: Cross multiply
    250.42x = 375.70 × 128.77
  4. Step 4: Simplify right side
    250.42x = 48,378.89
  5. Step 5: Solve for x
    x = 48,378.89/250.42
  6. Step 6: Final answer
    x = 193.19

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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.