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Finding the Fourth Proportional to 310.76, 465.92 and 128.24

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Solution

The fourth proportional to 310.76, 465.92 and 128.24 is: 192.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.76 : 465.92 = 128.24 : x
  2. Step 2: Convert to fraction form
    310.76/465.92 = 128.24/x
  3. Step 3: Cross multiply
    310.76x = 465.92 × 128.24
  4. Step 4: Simplify right side
    310.76x = 59,749.58
  5. Step 5: Solve for x
    x = 59,749.58/310.76
  6. Step 6: Final answer
    x = 192.27

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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.