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Finding the Fourth Proportional to 7,899.78, 11,851.68 and 2,705.64

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Solution

The fourth proportional to 7,899.78, 11,851.68 and 2,705.64 is: 4,059.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,899.78 : 11,851.68 = 2,705.64 : x
  2. Step 2: Convert to fraction form
    7,899.78/11,851.68 = 2,705.64/x
  3. Step 3: Cross multiply
    7,899.78x = 11,851.68 × 2,705.64
  4. Step 4: Simplify right side
    7,899.78x = 32,066,379.48
  5. Step 5: Solve for x
    x = 32,066,379.48/7,899.78
  6. Step 6: Final answer
    x = 4,059.15

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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.