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Finding the Fourth Proportional to 493.78, 740.80 and 440.06

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Solution

The fourth proportional to 493.78, 740.80 and 440.06 is: 660.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.78 : 740.80 = 440.06 : x
  2. Step 2: Convert to fraction form
    493.78/740.80 = 440.06/x
  3. Step 3: Cross multiply
    493.78x = 740.80 × 440.06
  4. Step 4: Simplify right side
    493.78x = 325,996.45
  5. Step 5: Solve for x
    x = 325,996.45/493.78
  6. Step 6: Final answer
    x = 660.21

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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.