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Finding the Fourth Proportional to 1,048.80, 1,573.20 and 399.45

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Solution

The fourth proportional to 1,048.80, 1,573.20 and 399.45 is: 599.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.80 : 1,573.20 = 399.45 : x
  2. Step 2: Convert to fraction form
    1,048.80/1,573.20 = 399.45/x
  3. Step 3: Cross multiply
    1,048.80x = 1,573.20 × 399.45
  4. Step 4: Simplify right side
    1,048.80x = 628,414.74
  5. Step 5: Solve for x
    x = 628,414.74/1,048.80
  6. Step 6: Final answer
    x = 599.18

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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.