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Finding the Fourth Proportional to 1,326.98, 1,990.59 and 353.09

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Solution

The fourth proportional to 1,326.98, 1,990.59 and 353.09 is: 529.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.98 : 1,990.59 = 353.09 : x
  2. Step 2: Convert to fraction form
    1,326.98/1,990.59 = 353.09/x
  3. Step 3: Cross multiply
    1,326.98x = 1,990.59 × 353.09
  4. Step 4: Simplify right side
    1,326.98x = 702,857.42
  5. Step 5: Solve for x
    x = 702,857.42/1,326.98
  6. Step 6: Final answer
    x = 529.67

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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.