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Finding the Fourth Proportional to 265.49, 397.62 and 128.64

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Solution

The fourth proportional to 265.49, 397.62 and 128.64 is: 192.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.49 : 397.62 = 128.64 : x
  2. Step 2: Convert to fraction form
    265.49/397.62 = 128.64/x
  3. Step 3: Cross multiply
    265.49x = 397.62 × 128.64
  4. Step 4: Simplify right side
    265.49x = 51,149.84
  5. Step 5: Solve for x
    x = 51,149.84/265.49
  6. Step 6: Final answer
    x = 192.67

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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.