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Finding the Fourth Proportional to 8,729.30, 13,079.55 and 8,210.90

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Solution

The fourth proportional to 8,729.30, 13,079.55 and 8,210.90 is: 12,302.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,729.30 : 13,079.55 = 8,210.90 : x
  2. Step 2: Convert to fraction form
    8,729.30/13,079.55 = 8,210.90/x
  3. Step 3: Cross multiply
    8,729.30x = 13,079.55 × 8,210.90
  4. Step 4: Simplify right side
    8,729.30x = 107,394,877.10
  5. Step 5: Solve for x
    x = 107,394,877.10/8,729.30
  6. Step 6: Final answer
    x = 12,302.81

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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.