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Finding the Fourth Proportional to 8,688.90, 11,990.73 and 4,709.99

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Solution

The fourth proportional to 8,688.90, 11,990.73 and 4,709.99 is: 6,499.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,688.90 : 11,990.73 = 4,709.99 : x
  2. Step 2: Convert to fraction form
    8,688.90/11,990.73 = 4,709.99/x
  3. Step 3: Cross multiply
    8,688.90x = 11,990.73 × 4,709.99
  4. Step 4: Simplify right side
    8,688.90x = 56,476,158.44
  5. Step 5: Solve for x
    x = 56,476,158.44/8,688.90
  6. Step 6: Final answer
    x = 6,499.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.