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Finding the Fourth Proportional to 1,330.45, 1,995.60 and 405.99

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Solution

The fourth proportional to 1,330.45, 1,995.60 and 405.99 is: 608.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.45 : 1,995.60 = 405.99 : x
  2. Step 2: Convert to fraction form
    1,330.45/1,995.60 = 405.99/x
  3. Step 3: Cross multiply
    1,330.45x = 1,995.60 × 405.99
  4. Step 4: Simplify right side
    1,330.45x = 810,193.64
  5. Step 5: Solve for x
    x = 810,193.64/1,330.45
  6. Step 6: Final answer
    x = 608.96

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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.