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Finding the Fourth Proportional to 1,330.41, 1,995.90 and 405.87

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Solution

The fourth proportional to 1,330.41, 1,995.90 and 405.87 is: 608.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.41 : 1,995.90 = 405.87 : x
  2. Step 2: Convert to fraction form
    1,330.41/1,995.90 = 405.87/x
  3. Step 3: Cross multiply
    1,330.41x = 1,995.90 × 405.87
  4. Step 4: Simplify right side
    1,330.41x = 810,075.93
  5. Step 5: Solve for x
    x = 810,075.93/1,330.41
  6. Step 6: Final answer
    x = 608.89

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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.