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Finding the Fourth Proportional to 13,149.71, 18,145.90 and 7,180.21

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Solution

The fourth proportional to 13,149.71, 18,145.90 and 7,180.21 is: 9,908.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,149.71 : 18,145.90 = 7,180.21 : x
  2. Step 2: Convert to fraction form
    13,149.71/18,145.90 = 7,180.21/x
  3. Step 3: Cross multiply
    13,149.71x = 18,145.90 × 7,180.21
  4. Step 4: Simplify right side
    13,149.71x = 130,291,309.32
  5. Step 5: Solve for x
    x = 130,291,309.32/13,149.71
  6. Step 6: Final answer
    x = 9,908.31

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Half scale
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Double scale
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Similar ratio
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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.