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Finding the Fourth Proportional to 8,685.84, 11,986.80 and 4,909.80

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Solution

The fourth proportional to 8,685.84, 11,986.80 and 4,909.80 is: 6,775.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.84 : 11,986.80 = 4,909.80 : x
  2. Step 2: Convert to fraction form
    8,685.84/11,986.80 = 4,909.80/x
  3. Step 3: Cross multiply
    8,685.84x = 11,986.80 × 4,909.80
  4. Step 4: Simplify right side
    8,685.84x = 58,852,790.64
  5. Step 5: Solve for x
    x = 58,852,790.64/8,685.84
  6. Step 6: Final answer
    x = 6,775.72

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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.