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Finding the Fourth Proportional to 402.85, 604.32 and 128.95

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Solution

The fourth proportional to 402.85, 604.32 and 128.95 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.85 : 604.32 = 128.95 : x
  2. Step 2: Convert to fraction form
    402.85/604.32 = 128.95/x
  3. Step 3: Cross multiply
    402.85x = 604.32 × 128.95
  4. Step 4: Simplify right side
    402.85x = 77,927.06
  5. Step 5: Solve for x
    x = 77,927.06/402.85
  6. Step 6: Final answer
    x = 193.44

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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.