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Finding the Fourth Proportional to 1,330.09, 1,995.14 and 405.63

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Solution

The fourth proportional to 1,330.09, 1,995.14 and 405.63 is: 608.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.09 : 1,995.14 = 405.63 : x
  2. Step 2: Convert to fraction form
    1,330.09/1,995.14 = 405.63/x
  3. Step 3: Cross multiply
    1,330.09x = 1,995.14 × 405.63
  4. Step 4: Simplify right side
    1,330.09x = 809,289.65
  5. Step 5: Solve for x
    x = 809,289.65/1,330.09
  6. Step 6: Final answer
    x = 608.45

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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.