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Finding the Fourth Proportional to 491.75, 737.63 and 393.80

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Solution

The fourth proportional to 491.75, 737.63 and 393.80 is: 590.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.75 : 737.63 = 393.80 : x
  2. Step 2: Convert to fraction form
    491.75/737.63 = 393.80/x
  3. Step 3: Cross multiply
    491.75x = 737.63 × 393.80
  4. Step 4: Simplify right side
    491.75x = 290,475.99
  5. Step 5: Solve for x
    x = 290,475.99/491.75
  6. Step 6: Final answer
    x = 590.70

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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.