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Finding the Fourth Proportional to 1,048.38, 1,571.20 and 431.36

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Solution

The fourth proportional to 1,048.38, 1,571.20 and 431.36 is: 646.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.38 : 1,571.20 = 431.36 : x
  2. Step 2: Convert to fraction form
    1,048.38/1,571.20 = 431.36/x
  3. Step 3: Cross multiply
    1,048.38x = 1,571.20 × 431.36
  4. Step 4: Simplify right side
    1,048.38x = 677,749.79
  5. Step 5: Solve for x
    x = 677,749.79/1,048.38
  6. Step 6: Final answer
    x = 646.48

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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.