Home / 13,115.69-18,099.86-7,147.36

Finding the Fourth Proportional to 13,115.69, 18,099.86 and 7,147.36

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Solution

The fourth proportional to 13,115.69, 18,099.86 and 7,147.36 is: 9,863.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,115.69 : 18,099.86 = 7,147.36 : x
  2. Step 2: Convert to fraction form
    13,115.69/18,099.86 = 7,147.36/x
  3. Step 3: Cross multiply
    13,115.69x = 18,099.86 × 7,147.36
  4. Step 4: Simplify right side
    13,115.69x = 129,366,134.38
  5. Step 5: Solve for x
    x = 129,366,134.38/13,115.69
  6. Step 6: Final answer
    x = 9,863.47

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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.