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Finding the Fourth Proportional to 1,048.57, 1,573.05 and 399.25

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Solution

The fourth proportional to 1,048.57, 1,573.05 and 399.25 is: 598.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.57 : 1,573.05 = 399.25 : x
  2. Step 2: Convert to fraction form
    1,048.57/1,573.05 = 399.25/x
  3. Step 3: Cross multiply
    1,048.57x = 1,573.05 × 399.25
  4. Step 4: Simplify right side
    1,048.57x = 628,040.21
  5. Step 5: Solve for x
    x = 628,040.21/1,048.57
  6. Step 6: Final answer
    x = 598.95

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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.