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Finding the Fourth Proportional to 8,666.37, 12,999.69 and 3,123.72

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Solution

The fourth proportional to 8,666.37, 12,999.69 and 3,123.72 is: 4,685.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.37 : 12,999.69 = 3,123.72 : x
  2. Step 2: Convert to fraction form
    8,666.37/12,999.69 = 3,123.72/x
  3. Step 3: Cross multiply
    8,666.37x = 12,999.69 × 3,123.72
  4. Step 4: Simplify right side
    8,666.37x = 40,607,391.65
  5. Step 5: Solve for x
    x = 40,607,391.65/8,666.37
  6. Step 6: Final answer
    x = 4,685.63

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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.