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Finding the Fourth Proportional to 8,611.96, 12,930.90 and 4,918.36

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Solution

The fourth proportional to 8,611.96, 12,930.90 and 4,918.36 is: 7,384.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.96 : 12,930.90 = 4,918.36 : x
  2. Step 2: Convert to fraction form
    8,611.96/12,930.90 = 4,918.36/x
  3. Step 3: Cross multiply
    8,611.96x = 12,930.90 × 4,918.36
  4. Step 4: Simplify right side
    8,611.96x = 63,598,821.32
  5. Step 5: Solve for x
    x = 63,598,821.32/8,611.96
  6. Step 6: Final answer
    x = 7,384.94

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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.