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Finding the Fourth Proportional to 11,370, 15,690.60 and 7,181.76

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Solution

The fourth proportional to 11,370, 15,690.60 and 7,181.76 is: 9,910.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,370 : 15,690.60 = 7,181.76 : x
  2. Step 2: Convert to fraction form
    11,370/15,690.60 = 7,181.76/x
  3. Step 3: Cross multiply
    11,370x = 15,690.60 × 7,181.76
  4. Step 4: Simplify right side
    11,370x = 112,686,123.46
  5. Step 5: Solve for x
    x = 112,686,123.46/11,370
  6. Step 6: Final answer
    x = 9,910.83

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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.