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Finding the Fourth Proportional to 628.88, 943.32 and 172.88

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Solution

The fourth proportional to 628.88, 943.32 and 172.88 is: 259.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.88 : 943.32 = 172.88 : x
  2. Step 2: Convert to fraction form
    628.88/943.32 = 172.88/x
  3. Step 3: Cross multiply
    628.88x = 943.32 × 172.88
  4. Step 4: Simplify right side
    628.88x = 163,076.45
  5. Step 5: Solve for x
    x = 163,076.45/628.88
  6. Step 6: Final answer
    x = 259.31

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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.