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Finding the Fourth Proportional to 8,425.80, 12,638.70 and 7,129.80

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Solution

The fourth proportional to 8,425.80, 12,638.70 and 7,129.80 is: 10,694.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,425.80 : 12,638.70 = 7,129.80 : x
  2. Step 2: Convert to fraction form
    8,425.80/12,638.70 = 7,129.80/x
  3. Step 3: Cross multiply
    8,425.80x = 12,638.70 × 7,129.80
  4. Step 4: Simplify right side
    8,425.80x = 90,111,403.26
  5. Step 5: Solve for x
    x = 90,111,403.26/8,425.80
  6. Step 6: Final answer
    x = 10,694.70

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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.