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Finding the Fourth Proportional to 8,666.89, 12,989.53 and 3,981.92

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Solution

The fourth proportional to 8,666.89, 12,989.53 and 3,981.92 is: 5,967.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.89 : 12,989.53 = 3,981.92 : x
  2. Step 2: Convert to fraction form
    8,666.89/12,989.53 = 3,981.92/x
  3. Step 3: Cross multiply
    8,666.89x = 12,989.53 × 3,981.92
  4. Step 4: Simplify right side
    8,666.89x = 51,723,269.30
  5. Step 5: Solve for x
    x = 51,723,269.30/8,666.89
  6. Step 6: Final answer
    x = 5,967.92

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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.