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Finding the Fourth Proportional to 1,129.50, 1,694.48 and 399.21

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Solution

The fourth proportional to 1,129.50, 1,694.48 and 399.21 is: 598.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.50 : 1,694.48 = 399.21 : x
  2. Step 2: Convert to fraction form
    1,129.50/1,694.48 = 399.21/x
  3. Step 3: Cross multiply
    1,129.50x = 1,694.48 × 399.21
  4. Step 4: Simplify right side
    1,129.50x = 676,451.36
  5. Step 5: Solve for x
    x = 676,451.36/1,129.50
  6. Step 6: Final answer
    x = 598.89

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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.