Home / 11,129.96-15,343.08-7,980.68

Finding the Fourth Proportional to 11,129.96, 15,343.08 and 7,980.68

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Solution

The fourth proportional to 11,129.96, 15,343.08 and 7,980.68 is: 11,001.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,129.96 : 15,343.08 = 7,980.68 : x
  2. Step 2: Convert to fraction form
    11,129.96/15,343.08 = 7,980.68/x
  3. Step 3: Cross multiply
    11,129.96x = 15,343.08 × 7,980.68
  4. Step 4: Simplify right side
    11,129.96x = 122,448,211.69
  5. Step 5: Solve for x
    x = 122,448,211.69/11,129.96
  6. Step 6: Final answer
    x = 11,001.68

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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.