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Finding the Fourth Proportional to 8,660.79, 12,988.62 and 2,814.21

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Solution

The fourth proportional to 8,660.79, 12,988.62 and 2,814.21 is: 4,220.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.79 : 12,988.62 = 2,814.21 : x
  2. Step 2: Convert to fraction form
    8,660.79/12,988.62 = 2,814.21/x
  3. Step 3: Cross multiply
    8,660.79x = 12,988.62 × 2,814.21
  4. Step 4: Simplify right side
    8,660.79x = 36,552,704.29
  5. Step 5: Solve for x
    x = 36,552,704.29/8,660.79
  6. Step 6: Final answer
    x = 4,220.48

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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.