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Finding the Fourth Proportional to 1,330.17, 1,995.45 and 405.69

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Solution

The fourth proportional to 1,330.17, 1,995.45 and 405.69 is: 608.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.17 : 1,995.45 = 405.69 : x
  2. Step 2: Convert to fraction form
    1,330.17/1,995.45 = 405.69/x
  3. Step 3: Cross multiply
    1,330.17x = 1,995.45 × 405.69
  4. Step 4: Simplify right side
    1,330.17x = 809,534.11
  5. Step 5: Solve for x
    x = 809,534.11/1,330.17
  6. Step 6: Final answer
    x = 608.59

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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.