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Finding the Fourth Proportional to 491.20, 737.60 and 355.20

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Solution

The fourth proportional to 491.20, 737.60 and 355.20 is: 533.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.20 : 737.60 = 355.20 : x
  2. Step 2: Convert to fraction form
    491.20/737.60 = 355.20/x
  3. Step 3: Cross multiply
    491.20x = 737.60 × 355.20
  4. Step 4: Simplify right side
    491.20x = 261,995.52
  5. Step 5: Solve for x
    x = 261,995.52/491.20
  6. Step 6: Final answer
    x = 533.38

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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.