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Finding the Fourth Proportional to 8,685.60, 11,983.80 and 5,145.88

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Solution

The fourth proportional to 8,685.60, 11,983.80 and 5,145.88 is: 7,099.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.60 : 11,983.80 = 5,145.88 : x
  2. Step 2: Convert to fraction form
    8,685.60/11,983.80 = 5,145.88/x
  3. Step 3: Cross multiply
    8,685.60x = 11,983.80 × 5,145.88
  4. Step 4: Simplify right side
    8,685.60x = 61,667,196.74
  5. Step 5: Solve for x
    x = 61,667,196.74/8,685.60
  6. Step 6: Final answer
    x = 7,099.94

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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.