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Finding the Fourth Proportional to 310.88, 466.51 and 128.28

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Solution

The fourth proportional to 310.88, 466.51 and 128.28 is: 192.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.88 : 466.51 = 128.28 : x
  2. Step 2: Convert to fraction form
    310.88/466.51 = 128.28/x
  3. Step 3: Cross multiply
    310.88x = 466.51 × 128.28
  4. Step 4: Simplify right side
    310.88x = 59,843.90
  5. Step 5: Solve for x
    x = 59,843.90/310.88
  6. Step 6: Final answer
    x = 192.50

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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.