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Finding the Fourth Proportional to 1,272.50, 1,908.69 and 406.70

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Solution

The fourth proportional to 1,272.50, 1,908.69 and 406.70 is: 610.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.50 : 1,908.69 = 406.70 : x
  2. Step 2: Convert to fraction form
    1,272.50/1,908.69 = 406.70/x
  3. Step 3: Cross multiply
    1,272.50x = 1,908.69 × 406.70
  4. Step 4: Simplify right side
    1,272.50x = 776,264.22
  5. Step 5: Solve for x
    x = 776,264.22/1,272.50
  6. Step 6: Final answer
    x = 610.03

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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.