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Finding the Fourth Proportional to 5,145, 7,103.16 and 3,900.84

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Solution

The fourth proportional to 5,145, 7,103.16 and 3,900.84 is: 5,385.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,145 : 7,103.16 = 3,900.84 : x
  2. Step 2: Convert to fraction form
    5,145/7,103.16 = 3,900.84/x
  3. Step 3: Cross multiply
    5,145x = 7,103.16 × 3,900.84
  4. Step 4: Simplify right side
    5,145x = 27,708,290.65
  5. Step 5: Solve for x
    x = 27,708,290.65/5,145
  6. Step 6: Final answer
    x = 5,385.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.