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Finding the Fourth Proportional to 7,145.99, 9,862.05 and 4,161.64

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Solution

The fourth proportional to 7,145.99, 9,862.05 and 4,161.64 is: 5,743.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145.99 : 9,862.05 = 4,161.64 : x
  2. Step 2: Convert to fraction form
    7,145.99/9,862.05 = 4,161.64/x
  3. Step 3: Cross multiply
    7,145.99x = 9,862.05 × 4,161.64
  4. Step 4: Simplify right side
    7,145.99x = 41,042,301.76
  5. Step 5: Solve for x
    x = 41,042,301.76/7,145.99
  6. Step 6: Final answer
    x = 5,743.40

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1.5x scale

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.