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Finding the Fourth Proportional to 7,929.96, 11,899.56 and 7,321.02

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Solution

The fourth proportional to 7,929.96, 11,899.56 and 7,321.02 is: 10,985.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,929.96 : 11,899.56 = 7,321.02 : x
  2. Step 2: Convert to fraction form
    7,929.96/11,899.56 = 7,321.02/x
  3. Step 3: Cross multiply
    7,929.96x = 11,899.56 × 7,321.02
  4. Step 4: Simplify right side
    7,929.96x = 87,116,916.75
  5. Step 5: Solve for x
    x = 87,116,916.75/7,929.96
  6. Step 6: Final answer
    x = 10,985.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.