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Finding the Fourth Proportional to 8,638.87, 12,890.90 and 7,708.03

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Solution

The fourth proportional to 8,638.87, 12,890.90 and 7,708.03 is: 11,501.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.87 : 12,890.90 = 7,708.03 : x
  2. Step 2: Convert to fraction form
    8,638.87/12,890.90 = 7,708.03/x
  3. Step 3: Cross multiply
    8,638.87x = 12,890.90 × 7,708.03
  4. Step 4: Simplify right side
    8,638.87x = 99,363,379.47
  5. Step 5: Solve for x
    x = 99,363,379.47/8,638.87
  6. Step 6: Final answer
    x = 11,501.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.