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Finding the Fourth Proportional to 13,122.69, 18,109.08 and 7,153.99

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Solution

The fourth proportional to 13,122.69, 18,109.08 and 7,153.99 is: 9,872.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,122.69 : 18,109.08 = 7,153.99 : x
  2. Step 2: Convert to fraction form
    13,122.69/18,109.08 = 7,153.99/x
  3. Step 3: Cross multiply
    13,122.69x = 18,109.08 × 7,153.99
  4. Step 4: Simplify right side
    13,122.69x = 129,552,177.23
  5. Step 5: Solve for x
    x = 129,552,177.23/13,122.69
  6. Step 6: Final answer
    x = 9,872.38

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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.