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Finding the Fourth Proportional to 8,659.09, 12,988.64 and 6,938.65

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Solution

The fourth proportional to 8,659.09, 12,988.64 and 6,938.65 is: 10,407.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.09 : 12,988.64 = 6,938.65 : x
  2. Step 2: Convert to fraction form
    8,659.09/12,988.64 = 6,938.65/x
  3. Step 3: Cross multiply
    8,659.09x = 12,988.64 × 6,938.65
  4. Step 4: Simplify right side
    8,659.09x = 90,123,626.94
  5. Step 5: Solve for x
    x = 90,123,626.94/8,659.09
  6. Step 6: Final answer
    x = 10,407.98

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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.