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Finding the Fourth Proportional to 5,190, 7,785 and 1,727.52

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Solution

The fourth proportional to 5,190, 7,785 and 1,727.52 is: 2,591.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,190 : 7,785 = 1,727.52 : x
  2. Step 2: Convert to fraction form
    5,190/7,785 = 1,727.52/x
  3. Step 3: Cross multiply
    5,190x = 7,785 × 1,727.52
  4. Step 4: Simplify right side
    5,190x = 13,448,743.20
  5. Step 5: Solve for x
    x = 13,448,743.20/5,190
  6. Step 6: Final answer
    x = 2,591.28

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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.