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Finding the Fourth Proportional to 1,048.39, 1,571.81 and 431.87

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Solution

The fourth proportional to 1,048.39, 1,571.81 and 431.87 is: 647.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.39 : 1,571.81 = 431.87 : x
  2. Step 2: Convert to fraction form
    1,048.39/1,571.81 = 431.87/x
  3. Step 3: Cross multiply
    1,048.39x = 1,571.81 × 431.87
  4. Step 4: Simplify right side
    1,048.39x = 678,822.59
  5. Step 5: Solve for x
    x = 678,822.59/1,048.39
  6. Step 6: Final answer
    x = 647.49

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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.