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Finding the Fourth Proportional to 491.21, 736.50 and 259.95

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Solution

The fourth proportional to 491.21, 736.50 and 259.95 is: 389.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.21 : 736.50 = 259.95 : x
  2. Step 2: Convert to fraction form
    491.21/736.50 = 259.95/x
  3. Step 3: Cross multiply
    491.21x = 736.50 × 259.95
  4. Step 4: Simplify right side
    491.21x = 191,453.18
  5. Step 5: Solve for x
    x = 191,453.18/491.21
  6. Step 6: Final answer
    x = 389.76

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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.