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Finding the Fourth Proportional to 493.88, 740.82 and 128.66

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Solution

The fourth proportional to 493.88, 740.82 and 128.66 is: 192.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.88 : 740.82 = 128.66 : x
  2. Step 2: Convert to fraction form
    493.88/740.82 = 128.66/x
  3. Step 3: Cross multiply
    493.88x = 740.82 × 128.66
  4. Step 4: Simplify right side
    493.88x = 95,313.90
  5. Step 5: Solve for x
    x = 95,313.90/493.88
  6. Step 6: Final answer
    x = 192.99

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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.