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Finding the Fourth Proportional to 8,685.60, 11,984.04 and 5,149.68

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Solution

The fourth proportional to 8,685.60, 11,984.04 and 5,149.68 is: 7,105.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.60 : 11,984.04 = 5,149.68 : x
  2. Step 2: Convert to fraction form
    8,685.60/11,984.04 = 5,149.68/x
  3. Step 3: Cross multiply
    8,685.60x = 11,984.04 × 5,149.68
  4. Step 4: Simplify right side
    8,685.60x = 61,713,971.11
  5. Step 5: Solve for x
    x = 61,713,971.11/8,685.60
  6. Step 6: Final answer
    x = 7,105.32

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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.